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

Russian President Vladimir Putin on Tuesday lowered the threshold for a nuclear strike in response to a broader range of conventional attacks, and Moscow said Ukraine had struck deep inside Russia with U.

Russian President Vladimir Putin signed a revised nuclear doctrine stating that any attack on Russia supported by a country with nuclear power could potentially trigger a nuclear response.