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;

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.

He declared that a conventional attack by any nation supported by a nuclear power will be considered a joint attack on Russia.