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 US-made weapons. Under the updated doctrine issued Tuesday,

Russia’s updated nuclear doctrine designates aggression against itself or allies by non-nuclear states, supported by nuclear states, as a joint attack. This comes as Ukraine executes its first strike in Russia using Western missiles.

Ukraine's President Zelensky reacts to the US decision by saying "such things are not announced. Missiles will speak for themselves".