Understanding the conflict one year on.

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MUSKO NAVAL BASE, Sweden—In a control room carved out of a mountainside near Stockholm, with seats four rows deep, Swedish Navy chief Ewa Skoog Haslum and a close gaggle of her staff look up at a giant monitor to see a troubling scenario unfolding in the Baltic Sea, almost in real time. Their ships are outnumbered. No one, it seems, is coming to help.

MUSKO NAVAL BASE, Sweden—In a control room carved out of a mountainside near Stockholm, with seats four rows deep, Swedish Navy chief Ewa Skoog Haslum and a close gaggle of her staff look up at a giant monitor to see a troubling scenario unfolding in the Baltic Sea, almost in real time. Their ships are outnumbered. No one, it seems, is coming to help.

This is real life, not a simulation or a war game. It’s October 2023, some 17 months since Sweden launched its bid for NATO membership, and the country is still outside of the alliance. On a filtered maritime traffic map of the region projected above the sailors’ heads, several lonely Swedish and Finnish ships, marked in blue, make their way through the straits, gulfs, and thoroughfares of the eastern arm of the Atlantic Ocean. Without the help of the 31-nation alliance, they are dwarfed by red dots—Russian ships, some military, and others that the Swedes fear might have bad intentions—moving up and down the waterway.

Add Sweden to NATO, and the map changes completely.

An undated military handout photo shows Ukrainian soldiers , their faces blurred, gathered around a radar screen as they undergo training in Sweden. Sweden Armed Forces

“Can we unfilter the picture?” one of Skoog Haslum’s aides asks. Dozens of green ships—NATO vessels—light up the map. The Russian fleet is vastly outnumbered. The tables have turned, Swedish officials said. Taking a shot at one of a handful of Swedish or Finnish ships is one thing. How are the Russians going to take a shot at the Swedish Navy when it has dozens of allied vessels at its back? Defense industry bigwigs, former generals, and think tankers visiting the maritime operations center at Musko Naval Base whisper in hushed awe.

For the better part of 200 years, dating back to the time of Napoleon, Sweden was a neutral country, with its armed forces not venturing beyond its large archipelagoes. Sweden flirted with a defensive nuclear weapons program and mass conscription during the long years of the Cold War but formally stayed neutral.

Russia’s full-scale invasion of Ukraine in February 2022 changed all of that. Fearing Russia’s expansionist impulses wouldn’t stop with Ukraine, Sweden, along with Finland, applied for NATO membership in a once-in-a-lifetime political swerve. “There is absolutely a before and after,” Skoog Haslum said last October. “We are more on our toes today.” Now, a step closer to membership in the alliance after Turkey moved to approve Sweden’s bid—but with the Hungarians still holding out—Swedish and NATO officials are hoping that swerve will give the Russians pause before causing problems on their northern border.

A handout sketch shows the Swedish Navy’s new surface combat ship on the left, alongside the smaller existing Visby-class corvette, as they patrol the Baltic Sea.SAAb artist rendering/Sweden Armed Forces

The first thing you see when you hit the docks at Berga Naval Base, a short boat ride across the Stockholm Archipelago from the control room at Musko Naval Base, is the 230-foot-long gray camouflage hull of the HSwMS Helsingborg. It doesn’t look like any old U.S. or European ship. The carbon fiber-reinforced frame resembles a pyramid, pointing skyward, to hide from Russian radar.

In a darkened room of computer banks on the ship’s bridge, sailors look at a sea of blue, green, and red ships, too. They are tracking anywhere from 4,000 to 6,000 ship movements in the Baltic Sea every day. On screen, cargo ships such as the Marshal Rokossovsky, the Aleksandr Evlanov, and the Sparta II sail past the Baltic Sea inlets.

If the sailors look nervous, they have a right to be. All of the Nordic countries—including Denmark, Finland, Norway, and Sweden—are heavily dependent on the latter’s western port of Gothenburg for trade. Sweden is especially so: About 30 percent of the country’s foreign trade flows through the port. Shutting down that one port could wreak havoc on the entire region’s economy.

And the screens on the computer banks are constantly changing. Since Russian President Vladimir Putin launched his full-scale invasion of Ukraine, Russian vessels have been moving out and staying away from the Baltic much longer. But the Kremlin is playing a bit of a shell game, Swedish officials said, switching bigger ships for smaller ones. By swapping out destroyers and frigates, which raise alarm bells for NATO countries, for smaller roll-on, roll-off vessels and maintenance ships that aren’t typically used in combat but can still be up-armed with cruise missiles, Russia can keep a foot on this vital chokehold without provoking suspicion.

The Kremlin has also been running tests right in Sweden’s backyard. Russia has begun trials of St. Petersburg-class submarines in the Baltic Sea, conducting live-fire exercises in international waters near Gotland, an island off Sweden’s eastern coast. The Kremlin tries to mask the new submarines by navigating through rivers and internal lakes before unleashing them in exercises that are clearly visible to nearby ships. From a signals intelligence ship parked just outside Kaliningrad’s bay, Sweden has detected Russia test-firing missiles from the submarines.

It all sounds pretty ominous. But the Swedes had to deal with the Russian threat long before the United States even existed. The two sides fought 11 wars, mostly over control of the Baltic Sea, before Stockholm began its two-century drift under neutrality. And with assets such as the Visby-class corvette—a stealthy surface ship armed with torpedoes and anti-ship missiles, named after the main city on Gotland—Sweden wants to be NATO’s eyes and ears in the region.

Russian navy officials and workers attend a ceremony to launch a diesel-electric torpedo submarine at a shipyard in St. Petersburg, Russia, on June 26, 2014. Olga Maltseva/AFP via Getty Images

Sweden can “be a very good NATO member,” Skoog Haslum said, including by providing targeting data for allies in the region.

The country has begun to field Link 22 command-and-control, a secure digital radio system that ties together NATO planes and ships. They are allowed to speak with other nations across those links but on a very low level, such as to point out unidentified or threatening vessels. It’s much easier for Skoog Haslum and her staff to call up Denmark and say hello than it was before the NATO bid, she said.

There’s just one problem: Sweden doesn’t have access to NATO’s encryption. Sweden creates new lines of communication for exercises with NATO countries, but most of those lines go dark once the exercises end. There are no classified communications—yet.

“When we join NATO, that would be on the screen all the time,” said Henrik Rosen, Sweden’s naval attache in Washington. “That is obviously a total game-changer for us.”

In almost every other way, the 31 allies are treating Sweden like one of their own. At NATO’s military headquarters in Mons, Belgium, officials point out that they have already built the flagpole where Sweden’s Nordic cross will eventually fly. At NATO’s official headquarters about an hour’s drive away, just about the only meetings the Swedes can’t get into are with the alliance’s nuclear planning group.

“We act as though they are a member,” a Nordic military official said at the alliance’s Brussels headquarters, where reporters arrived on Jan. 23, the day of Turkey’s parliamentary vote on Sweden’s accession, to discover a flagpole had been built for the Swedes there, too.

Although Turkey has finally, after months of foot-dragging, voted Sweden into the alliance, Hungary has not backed off its objections about Sweden’s NATO membership. Hungary wants Swedish opposition figures that are publicly critical of Hungarian Prime Minister Viktor Orban’s authoritarian leanings to shut up. (Orban came out publicly supporting Sweden’s bid after a call this week with NATO Secretary-General Jens Stoltenberg, but Hungary’s top lawmakers still had harsh words for Stockholm.)

U.S. Defense Secretary Lloyd Austin (left) and Swedish Defense Minister Pal Jonson address the media after a bilateral meeting at the Musko Naval Base, south of Stockholm, on April 19, 2023. Frederik Sandberg/TT NEWS AGENCY/AFP via Getty Images

But even with the NATO bid still on hold, Sweden appears to be taking a victory lap. In December, Swedish Defense Minister Pal Jonson traveled to the Reagan National Defense Forum in Simi Valley, California—an event full of national security high-rollers—and then on to Washington to sign a defense cooperation agreement with U.S. Defense Secretary Lloyd Austin that gives the U.S. military access to 17 Swedish military bases in the event of a regional war.

Jonson said Sweden’s muscular new foreign policy will push the country past NATO’s agreed-on 2 percent defense spending mark.

“This is the biggest shift in our doctrine for 200 years,” Jonson said in an interview at the Reagan Forum in the rolling southern California hills. “We will continue beyond 2.1 percent [of GDP].”

Where is the money going? Sweden is buying more U.S.-made Patriot air defense systems. It is building a whole new fleet of Gripen fighter jets. It is building new Collins-class submarines and new corvettes. And it is arming its troops with British-made light anti-tank weapons that have torn up Russian tanks in Ukraine as well as fresh armored personnel carriers.

If the name of the game is deterrence in Sweden, then it’s all hands on deck.

“Just being a ship at sea, with maybe a rifle or something, that is not deterrence,” Skoog Haslum said. “Deterrence is to have all assets you can have. The sensors, the weapons systems—that is deterrence.”

Polish, Swedish, Finnish, and NATO flags are set up prior to a signing ceremony celebrating Finland and Sweden’s proposed membership to the alliance in Gdynia, Poland, on July 20, 2022.Mateusz Slodkowski/AFP via Getty Images

Sweden stayed out of both world wars. And after the dust settled in World War II and the Iron Curtain came down, neighbors Norway, Iceland, and Denmark joined NATO. Sweden didn’t.

In secret, though, the Swedes were building up their defenses. During World War II, Sweden built emergency bomb shelters and landing strips as a fallback plan. In 1950, with the United States and the Soviet Union racing to test the first hydrogen bomb, the Swedish government began blasting 1.5 million tons of rock out of a mountainside on the island of Musko, about 25 miles south of Stockholm, to build a top-secret underground naval base.

It took them 19 years. But by the time Musko was completed, Swedish sailors could service submarines and destroyers through a cavernous labyrinth of underground tunnels—and even hunt Soviet submarines. Sweden even briefly pursued nuclear weapons of its own, until officials realized they would cost too much.

After the Cold War, the threat had cooled down enough that Sweden began a widespread process of hollowing out its military, a downturn that lasted nearly 30 years. Sweden gave away most of its 2,000 fighter jets. It shed troops. It got rid of bases.

By 2004, though Swedish troops were in Afghanistan and patrolling the coast of Lebanon, the Riksdag, Sweden’s parliament, was openly stating that the country faced no significant military threats and that it should pare down its defense capabilities to reflect that fact. Defending the homeland wasn’t a mission for the Swedish military anymore.

“The political slogan was, Sweden is best defended in Afghanistan,” said Oscar Jonsson, a defense specialist at the Swedish Defence University. “That was the armed forces we had.”

The only reason that the Swedish government didn’t get rid of Musko was because it would have been too expensive to scrub down the 12 miles of tunnels to make them safe for other uses. So the lights were kept on, but the massive facility was put on a strategic lull, with a skeletal staff. People still worked there 24 hours a day, seven days a week, even when the base was at its least active point, but civilian contractors came in to fill up the vacant shipyards, and tourists were even allowed in.

“It was a little bit of a pity,” Jonsson said. “First of all, you make a secret naval base that can withstand nuclear weapons. Then, at the end of the Cold War, you declassify it. Then, all of a sudden, you realize that it actually needed to be classified again.”

Swedish Rear Adm. Ewa Skoog Haslum (right) talks with Finnish Maj. Gen. Kari Nisula (center) and Swedish Lt. Gen. Carl-Johan Edstrom on board the coastal corvette Helsingborg in Oskarshamn, Sweden, on May 2, 2023.Adam Ihse/TT News Agency/AFP via Getty Images

In the Musko mountainside, in a conference room whose wood-paneled walls were made out of the remnants of an old Swedish destroyer, Skoog Haslum and her aides described the bruising effects of the belt tightening on the military. The first thing to go was personnel. The Army downsized from brigades, anywhere from 3,000 to 5,000 troops, to singular battalions, about 1,000 soldiers apiece. Weapons were next. The Navy decommissioned all of its big warships, such as destroyers and frigates, in the 1980s, leaving only smaller ships. The Air Force cut planes. In the mid-2010s, Sweden bottomed out, spending only about 1 percent of its GDP on defense, down from 4 percent in 1963.

But even though Sweden was still neutral, the irritations from Russia had started to pick up. Russian ships were aggressively maneuvering in the Baltic Sea, elbowing Swedish and Finnish ships out of their sea lanes. And Russia’s invasion of Ukraine in 2014, biting off Crimea and pieces of the Donbas region, made it clear to the Swedes that they could also have a target on their backs.

Sweden’s military budget began to grow in small steps. In 2019, just before the COVID-19 pandemic erupted, the Swedish naval staff returned to Musko. In 2020, the defense budget started to jump, to around $6.25 billion that year, or 1.2 percent of Sweden’s GDP.

Sweden decided to build two new submarines and four new surface ships with surface-to-air missile defenses, which hadn’t been aboard the pyramid-like Visby-class corvettes. Next year’s budget is getting boosted by nearly a third, bringing the overall defense tally to about $11 billion. Sweden is expecting to hit NATO’s 2 percent of GDP defense spending target by the time of the alliance’s Washington summit, which is penciled in for July.

“The rise of the last 10 years of defense spending [has] been very, very steep,” said Rosen, the Swedish naval attache.

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Still, Sweden is mostly building more of what it already has. Long-range land attack capability that could challenge Russia is not part of the plan yet.

But Musko is buzzing again. The mess halls are full of Marines with the Swedish Viking emblem pinned to their lapels. The bike racks are full, too, with sailors dropping off their two-wheeled rides—unlocked—after cycling around the miles of tunnels to meetings and maintenance yards.

Sweden’s defense industry is buzzing, too. The onetime carmaker Saab, which uses two of Musko’s drydocks to conduct maintenance on destroyers, has stopped building automobiles and is instead focusing on building Gripen fighter jets and diesel-electric submarines. Volvo builds a line of logistical trucks. Ericsson makes military telephones.

“There is no other country of 10 million that can produce submarines, fighter aircraft, surface combatants, [infantry fighting vehicles], and very advanced artillery systems,” said Jonson, the defense minister.

But unlike next-door neighbor Finland, which can mobilize nearly 300,000 troops from civilian ranks, Sweden faces the problem of getting enough people ready to man those weapons. The nation’s conscription model, which once could mobilize up to half of Sweden’s population, was cut down in the 1990s, tossed altogether in 2010, and has only recently been brought back.

Stockholm is hoping to bring the mobilization number from the current cap of 60,000 to 100,000 conscripts by the end of the decade. Swedish officials are open about the growing pains.

“We are growing, but it’s quite slow,” Skoog Haslum said. “It’s hard to grow, especially when you come from a capacity that is very, very short, actually.”

A Swedish CB90 is seen during a joint military exercise between Swedish and Finnish amphibious soldiers at Berga Naval Base outside Stockholm on April 28, 2023. Anders Wiklund/TT News Agency/AFP via Getty Images

The boyish-looking sailor had just two words for the group: Strap in.

This reporter soon found out why. Richard Cooke, the young Swedish Marine barking orders, and his driver Emil Munkve, proceeded to send the CB90 fast assault boat we were sitting in screaming through the Musko harbor at almost 50 miles an hour, putting the dozen or so American interlopers straight back in their seats.

Sweden boasts more than 267,000 islands (though, according to the Swedes, an “island” is any piece of land you can stand on with two dry feet).

And fighting here is not like fighting out in the great wide open of the Pacific Ocean. In fact, the U.S. Marines don’t have anything like the CB90. As it drives from Musko to Berga, islands and landforms pop out of the rock. But even in contested waters, the Swedish Marines can go almost anywhere in Stockholm’s island chain, dropping more than a dozen troops ashore at once.

“As long as there aren’t rocks sticking up, we can go right up on the beach,” Munkve said. “We can go as far as the Swedish coast goes.”

Adding that 2,000-mile-long coastline to territory under the alliance’s protection will change NATO. It’s a vast region spanning the Arctic Ocean to the North Sea inlets to the Atlantic, with data cables that undergird much of global communication deep beneath the water’s surface. NATO will get Swedish bases in the north to contend with Russian troops in Murmansk and on the Kola Peninsula.

The Nordic and Baltic countries can’t survive financially without keeping their archipelagoes and the inlets to the Baltic Sea open to maintain commerce through the region. And NATO will get another capable navy that can deal in shallow waters less than 200 feet deep dotted with gulfs, islands, narrow straits, and critical infrastructure.

“In our neck of the woods in the Baltic Sea region, the Western Sea, [and] the Nordic Sea, there’s a lot of infrastructure,” Rosen said. “There’s oil rigs, gas rigs, there’s underwater pipelines, there are underwater cables from communication to power. There are wind parks and windmills out at sea. And there’s a lot of traffic.”

Horse riders carry the Ukrainian flag as they ride through the streets of Visby, on Gotland Island, Sweden, during a demonstration against the Russian invasion of Ukraine, on March 3, 2022. Jonathan Nackstrand/AFP via Getty Images

There have been more NATO vessels in the Baltic Sea in the last two years since Russia’s full-scale invasion of Ukraine. And the Nordic countries have teamed up to follow Russian vessels across the sea with electric optical sensors and an encyclopedic ship base. Starting from Norway’s western coast, the Nordic countries track Russian ships all the way back to St. Petersburg, following them with fixed and mobile sensors, handing off country-by-country as the boats steam through the Baltic.

The Kremlin used to harass U.S. ships in the region. Now the shoe is on the other foot. “[Russia] followed every American vessel that entered the Baltic Sea before,” Skoog Haslum said. “They really followed it. They can’t do that any longer.”

Now, the Kremlin’s game plan is to surround and show presence toward the United Kingdom, the door jam at the western gate of the North Sea. Russia is almost equally as paranoid about keeping trade lanes open through the Baltic and is heavily dependent on getting through it and on to St. Petersburg and Kaliningrad, where the Kremlin has a great deal of its war industry, including shipyards for surface vessels and submarines, which can fire cruise missiles off their backs.

But even though Russia’s Baltic Fleet is largely intact, most of the Kremlin’s troops and ships are tied down by the war in Ukraine.

“Russia has now a long border with NATO … but doesn’t get more forces,” said Dutch Adm. Rob Bauer, the chair of NATO’s Military Committee. “If they want to invest in more forces, it will cost them.”

The Swedes have three watchwords for how they train to fight: Hide inside, run out fast, and hit hard. And they can make it tougher on the Russians by mining the narrow straits before raining missiles on the invaders.

“We use the archipelago. We hide in the archipelago. We fire our long-range weapons from within the archipelago or from the open sea,” one Swedish sailor said. There are still 50,000 mines on the Baltic seabed from World War I and World War II, forcing ships to navigate tight corners laden with explosives.

Sweden’s geography also tightens the squeeze on Russia. Everything in Kaliningrad and St. Petersburg will now be in range of NATO missiles. Gotland gives Sweden and NATO an opportunity to build out a logistical hub or block the Russian navy’s attempts to harass Western shipping lanes. The Bay of Bothnia is a lot closer to Russia’s northern sea bases than NATO’s borders currently sit.

On the flip side, NATO countries will have to defend another big Nordic state that is entirely within striking distance of Russian missiles. And Russia has finally hit Sweden with the avalanche of disinformation and cyberattacks it expected when the country’s NATO bid was announced in May 2022.

But Sweden is not backing down. Though the military shift in the country has been gradual, the political shift has been frenetic.

From left: Jonson, Swedish Prime Minister Ulf Kristersson, and Swedish Foreign Minister Tobias Billstrom hold a news conference on the country’s NATO bid in Stockholm on Jan. 24, 2023. Pontus Lundahl/TT News Agency/AFP via Getty Images

After two centuries of neutrality, a majority of Swedes only began to favor NATO membership in March 2022, one month after Russia’s full-scale invasion of Ukraine began. A month later, that number surged to nearly 60 percent.

In Brussels, NATO allies are ready to welcome them with open arms. But there is still a palpable sense of disbelief at how quickly the tectonic shift has taken place.

“If I told you Finland and Sweden were going to join, you would have thought I was smoking something,” the Nordic military official said. “We are part of a different landscape. Now we have to think completely differently.”

Reporting for this article was made possible by the Center for Maritime Strategy, in partnership with the Swedish Defence University.

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Sweden Is Making the Most of NATO’s Waiting Room

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04.02.2024

Understanding the conflict one year on.

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MUSKO NAVAL BASE, Sweden—In a control room carved out of a mountainside near Stockholm, with seats four rows deep, Swedish Navy chief Ewa Skoog Haslum and a close gaggle of her staff look up at a giant monitor to see a troubling scenario unfolding in the Baltic Sea, almost in real time. Their ships are outnumbered. No one, it seems, is coming to help.

MUSKO NAVAL BASE, Sweden—In a control room carved out of a mountainside near Stockholm, with seats four rows deep, Swedish Navy chief Ewa Skoog Haslum and a close gaggle of her staff look up at a giant monitor to see a troubling scenario unfolding in the Baltic Sea, almost in real time. Their ships are outnumbered. No one, it seems, is coming to help.

This is real life, not a simulation or a war game. It’s October 2023, some 17 months since Sweden launched its bid for NATO membership, and the country is still outside of the alliance. On a filtered maritime traffic map of the region projected above the sailors’ heads, several lonely Swedish and Finnish ships, marked in blue, make their way through the straits, gulfs, and thoroughfares of the eastern arm of the Atlantic Ocean. Without the help of the 31-nation alliance, they are dwarfed by red dots—Russian ships, some military, and others that the Swedes fear might have bad intentions—moving up and down the waterway.

Add Sweden to NATO, and the map changes completely.

An undated military handout photo shows Ukrainian soldiers , their faces blurred, gathered around a radar screen as they undergo training in Sweden. Sweden Armed Forces

“Can we unfilter the picture?” one of Skoog Haslum’s aides asks. Dozens of green ships—NATO vessels—light up the map. The Russian fleet is vastly outnumbered. The tables have turned, Swedish officials said. Taking a shot at one of a handful of Swedish or Finnish ships is one thing. How are the Russians going to take a shot at the Swedish Navy when it has dozens of allied vessels at its back? Defense industry bigwigs, former generals, and think tankers visiting the maritime operations center at Musko Naval Base whisper in hushed awe.

For the better part of 200 years, dating back to the time of Napoleon, Sweden was a neutral country, with its armed forces not venturing beyond its large archipelagoes. Sweden flirted with a defensive nuclear weapons program and mass conscription during the long years of the Cold War but formally stayed neutral.

Russia’s full-scale invasion of Ukraine in February 2022 changed all of that. Fearing Russia’s expansionist impulses wouldn’t stop with Ukraine, Sweden, along with Finland, applied for NATO membership in a once-in-a-lifetime political swerve. “There is absolutely a before and after,” Skoog Haslum said last October. “We are more on our toes today.” Now, a step closer to membership in the alliance after Turkey moved to approve Sweden’s bid—but with the Hungarians still holding out—Swedish and NATO officials are hoping that swerve will give the Russians pause before causing problems on their northern border.

A handout sketch shows the Swedish Navy’s new surface combat ship on the left, alongside the smaller existing Visby-class corvette, as they patrol the Baltic Sea.SAAb artist rendering/Sweden Armed Forces

The first thing you see when you hit the docks at Berga Naval Base, a short boat ride across the Stockholm Archipelago from the control room at Musko Naval Base, is the 230-foot-long gray camouflage hull of the HSwMS Helsingborg. It doesn’t look like any old U.S. or European ship. The carbon fiber-reinforced frame resembles a pyramid, pointing skyward, to hide from Russian radar.

In a darkened room of computer banks on the ship’s bridge, sailors look at a sea of blue, green, and red ships, too. They are tracking anywhere from 4,000 to 6,000 ship movements in the Baltic Sea every day. On screen, cargo ships such as the Marshal Rokossovsky, the Aleksandr Evlanov, and the Sparta II sail past the Baltic Sea inlets.

If the sailors look nervous, they have a right to be. All of the Nordic countries—including Denmark, Finland, Norway, and Sweden—are heavily dependent on the latter’s western port of Gothenburg for trade. Sweden is especially so: About 30 percent of the country’s foreign trade flows through the port. Shutting down that one port could wreak havoc on the entire region’s economy.

And the screens on the computer banks are constantly changing. Since Russian President Vladimir Putin launched his full-scale invasion of Ukraine, Russian vessels have been moving out and staying away from the Baltic much longer. But the Kremlin is playing a bit of a shell game, Swedish officials said, switching bigger ships for smaller ones. By swapping out destroyers and frigates, which raise alarm bells for NATO countries, for smaller roll-on, roll-off vessels and maintenance ships that aren’t typically used in combat but can still be up-armed with cruise missiles, Russia can keep a foot on this vital chokehold without provoking suspicion.

The Kremlin has also been running tests right in Sweden’s backyard. Russia has begun trials of St. Petersburg-class submarines in the Baltic Sea, conducting live-fire exercises in international waters near Gotland, an island off Sweden’s eastern coast. The Kremlin tries to mask the new submarines by navigating through rivers and internal lakes before unleashing them in exercises that are clearly visible to nearby ships. From a signals intelligence ship parked just outside Kaliningrad’s bay, Sweden has detected Russia test-firing missiles from the submarines.

It all sounds pretty ominous. But the Swedes had to deal with the Russian threat long before the United States even existed. The two sides fought 11 wars, mostly over control of the Baltic Sea, before Stockholm began its two-century drift under neutrality. And with........

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