Putin updates Russia's nuclear doctrine in response to Ukraine's deeper strike capabilities

President Vladimir Putin has updated Russia's nuclear doctrine, lowering the threshold for a nuclear response. The changes come after Ukraine received U.S. approval to use American weapons for deeper strikes against Russia. The new doctrine states that any aggression supported by a nuclear state will be treated as a joint attack. This expands the scenarios in which Russia might consider using nuclear weapons, now including various types of aerial threats. These developments follow recent U.S. decisions to allow Ukraine to strike deeper into Russian territory. The changes reflect ongoing tensions and the evolving military support for Ukraine from Western allies.