Russian President Vladimir Putin has approved a new nuclear doctrine, lowering the threshold for a nuclear strike in response to a broader range of conventional attacks. Here is some international reaction to Tuesday's move: WHITE HOUSE NATIONAL SECURITY COUNCIL "We were not surprised by Russia's announcement that it would update its nuclear doctrine;

A decree signed by the Russian leader, though long planned, came days after President Biden authorized the use of U.S.-supplied missiles by Ukraine for strikes inside Russia.