It is widely thought that the February 5 expiration of New START, the last arms control agreement capping US and Russian nuclear weapons, could usher in a dangerous and highly destabilizing new nuclear arms race. Since the Cold War peak of over 70,000 nuclear weapons in 1986, arms control treaties have reduced the number to approximately 12,200 today—still equivalent, however, to 145,000 Hiroshimas. Many of these decommissioned weapons remain in storage where they can be readily redeployed, making it possible to double Russian and US arsenals in one to two years.

If a new nuclear arms race begins between the US and Russia, the US could “upload” 800 bombs and cruise missiles stored at military bases back onto B-2 and B-52 bombers in a matter of weeks. The number of warheads on submarines could be increased by 400 to 500 by placing additional warheads on each missile and reusing the launch tubes that were closed under New START. Finally, by placing additional warheads on half of its intercontinental ballistic missiles and reloading silos on standby, it could double its ICBM warheads from 400 to 800. Similarly, hundreds of decommissioned Russian warheads could be uploaded onto its bombers, ICBMs, and submarines.

Moreover, both the US and Russia are modernizing their nuclear weapons and new, terrifying systems are being developed. Although their arsenals are much smaller, the other seven nuclear weapon states are also modernizing, and China is rapidly expanding its arsenal. France has also just announced it will increase the size of its arsenal. Several nonnuclear states are considering acquiring nuclear weapons, which would further proliferation and greatly complicate the global situation.

The development of nuclear weapons in space and dual-use technology add to the unpredictability, and the loss of verification and information exchange provided by arms control agreements contribute to greater uncertainty, misunderstanding, and worst-case thinking.

A nuclear war would be utterly catastrophic.

So, will a new nuclear arms race make us more secure?

Given the current very tense and fragile geopolitical environment and questions about the stability of the leaders involved, it is entirely possible that a conventional conflict could escalate into nuclear war. Indeed, the Russians have threatened to use nuclear weapons in the context of their war in Ukraine and they have also lowered their “nuclear doctrine” threshold for using nuclear weapons.

The book Nuclear War: A Scenario and the film A House of Dynamite both offer chilling but realistic scenarios whereby incoming ICBMs would be responded to by massive second-strike retaliation. In just over an hour, life as we know it would be shattered worldwide.

The other grave concern is accidental nuclear war; Published accounts offer multiple examples. Warnings of a nuclear attack have been triggered by a faulty 46-cent computer chip; the mistaken insertion of a training tape into a computer; moon-rise; nuclear submarine collisions; the launch of a weather rocket; and many others. There are also cyber threats that barely existed during the Cold War. Equally worrying is the slippery slope of AI, which could lead to its integration into US, Russian, and Chinese nuclear weapon systems, stimulated by........

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