Has the Russia-Ukraine war blown up the global nuclear order?

The Russian nuclear saber-rattling that has accompanied the invasion of Ukraine represents a level of nuclear risk unprecedented since the end of the Cold War. One wonders how global nuclear politics will adapt to these changing circumstances. The ongoing Russia-Ukraine war poses major challenges for several core international institutions and issues, from the upcoming Non-Proliferation Treaty review conference to President Biden’s proposed arms control efforts with Russia and China.