Carl Bildt

STOCKHOLM – Since 2014, Russia has brazenly violated Ukraine’s territorial integrity with incursions, illegal annexations, and a full-scale invasion. And now, Ukraine is violating Russia’s territorial integrity with its own incursion into the Kursk region.

There is, of course, a substantial difference between the two cases. The Russian Federation has officially, albeit illegally, absorbed Crimea and conquered territory in Ukraine’s Donbas region, and Vladimir Putin makes no secret of his intention to subjugate all of Ukraine. By contrast, Ukraine has made no territorial claims on any Russian land.

Still, for Europeans, territorial integrity is key, and Ukraine’s counteroffensive has brought the issue back into focus. While countries may have different reasons for supporting Ukraine in the conflict, defending the principle of territorial integrity is a shared imperative. After all, most of Europe’s borders were drawn in blood, and allowing them to be redrawn now would invite even more bloodshed. For decades, the current borders have been sacrosanct, because everyone understands that territorial integrity is the foundation underpinning peace on a continent that, until 1945, had been ravaged by centuries of war.

When the multinational, polyglot state of........

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