The New START Treaty between the US and Russia: The last surviving pillar of nuclear arms control

Summary:

The US and Russia both have formidable arsenals of potentially destructive nuclear weapons. Although a nuclear-free world remains a distant dream, the two countries have taken steps to limit the risk of nuclear conflict, through a series of arms control agreements limiting the number of strategic weapons that each can have. In force since 2011, the New Strategic Arms Reductions Treaty (New START) is the latest of these agreements.

Under New START, Russia and the US are limited to an equal number of deployed strategic warheads and weapons carrying them, such as intercontinental ballistic missiles. To ensure compliance, there are strict counting rules and transparency requirements, giving each side a reliable picture of the other's strategic nuclear forces.

The 2019 collapse of the Intermediate-range Nuclear Forces (INF) Treaty left New START as the only major surviving US-Russia arms control agreement. In early 2021, with New START due to expire in February and the two sides deadlocked over the conditions for extending it, it looked as if the last remaining restrictions on the world's two main nuclear powers were about to lapse.

Following a last-minute reprieve by newly elected US President, Joe Biden, the two parties agreed to extend New START until 2026, thereby giving each other welcome breathing space to negotiate a replacement treaty. There are still many unanswered questions about the kind of weapons that a future treaty could include.

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