At the end of January, Joe Biden and Vladimir Putin announced they had agreed on the extension of the New START agreement.
In doing so, they saved the last survivor of a range of major arms control treaties of the post-Cold War era.
Not only the arms control regime has crumbled, but also the principle of indivisibility of security, collective security and the European border regime.
He argues that we run the risk to stumble from incident to incident if we do not tackle the erosion of the post-Cold War order. But he also warns that rethinking this order will be particularly complicated.
The world has changed and a global approach, involving China, will be required.
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