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.

President Vladimir Putin has updated Russia’s nuclear doctrine, two days after his US counterpart Joe Biden granted Ukraine permission to strike targets deep inside Russia with American-made weapons.