Vladimir Putin signed off this morning on an updated version of the Kremlin's nuclear doctrine that broadens the scope for Moscow to turn to its fearsome atomic arsenal, on the same day that US-made missiles rained down on Russian soil. The new document, which replaces the previous iteration outlined in 2020, allows Putin's strategic forces to deploy their devastating weapons if Russia or Belarus is threatened by a non-nuclear nation supported by a nuclear power. Threats that could warrant a nuc