Russian President Vladimir Putin warned that Russia could use nuclear weapons if attacked with conventional arms, revising the country’s nuclear doctrine. In a Security Council meeting, Putin stated that an attack by a non-nuclear power with nuclear support would be seen as a “joint attack on Russia.” The revisions lower the threshold for nuclear use, amid Western allies considering longer-range weapons for Ukraine. Putin cited new global threats for the changes. Ukraine’s President Zelenskyy and his chief of staff dismissed Putin’s remarks as nuclear blackmail. The revised doctrine details conditions for nuclear use, including massive air attacks.