Russian President Vladimir Putin on Tuesday updated his nuclear weapons doctrine following President Biden's decision to allow Ukraine to use U.S.-supplied long-range missiles inside of Russia.

Putin's “Basic Principles of State Policy of the Russian Federation on Nuclear Deterrence” doctrine was changed to declare that any aggression from a nonnuclear state with support from a nuclear state will be regarded as a joint attack on Russia.

“The Russian Federation reserves the right to use nuclear weapons in case of aggression with the use of conventional weapons against it,” said Kremlin spokesperson Dmitry Peskov on Tuesday, according to TASS, a Russian state-run media outlet.