The New START Treaty between the U.S. and Russia expired in February 2026, marking the end of the last, major nuclear arms control agreement. Alarm bells went off with the United Nations Secretary-General, António Guterres noting that “for the first time in more than half a century, we face a world without any binding limits on the strategic nuclear arsenals.” So how do we re-institutionalise restraints in an age of re-emergent Great Power rivalry?

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