By Stephen M. Walt, Robert and Renee Belfer Professor of International Affairs at the Harvard Kennedy School.
By Georgia Cole, Research Associate, International Security Programme
On 4 February 2026, the New Strategic Arms Reduction Treaty (New START) is due to expire. If it does, it will mark the first time since the early 1970s that there will be no legally binding limits on US and Russian strategic nuclear forces without another agreement being under negotiation.
By Owen Matthews
Two of Ukraine’s most famous ballet dancers face dismissal, cancellation and possible mobilisation into the army. Their crime? They dared to dance a segment of Russian composer Pyotr Tchaikovsky’s Swan Lake during a European tour.
