Putin lowers nuclear use threshold after Biden's missile decision for Ukraine
President Vladimir Putin has officially lowered the threshold for Russia's use of nuclear weapons. This change follows U.S. President Joe Biden's decision to allow Ukraine to strike targets in Russia with longer-range missiles. The updated doctrine states that Russia may respond with nuclear force to conventional attacks supported by nuclear powers. It broadens the conditions under which nuclear weapons could be used, including responses to significant aerial attacks. The U.S. has not changed its nuclear posture in response to Russia's announcement. Officials view the rhetoric as irresponsible but emphasize that the arrival of North Korean troops in Russia represents a significant escalation.