Kremlin ups rhetoric over decision to allow Kyiv to use US long-range missiles for strikes inside Russia

• Russia-Ukraine war – latest news updates

Vladimir Putin has signed a decree lowering the threshold for using nuclear weapons, as the Kremlin intensified its rhetoric over Joe Biden’s decision to permit Kyiv to use US-made long-range missiles for strikes inside Russia.

The revised nuclear doctrine declares that a conventional attack on Russia by any nation that is supported by a nuclear power will be considered a joint attack on his country.