Moscow has once again threatened a nuclear strike on Ukraine. What does Putin's move to sign an amended nuclear doctrine mean, what kind of reaction from the West should be expected, and how might this affect the course of the war - read in the material by RBC-Ukraine.

Russia has changed its nuclear doctrine in response to the U.S. decision to allow Ukraine to fire American-made ballistic missiles deeper into Russia.

Vladimir Putin on Tuesday signed a decree revising Russia's nuclear doctrine to broaden the basis on which Moscow would consider using nukes, just two days after the U.S. authorized Ukraine to use its longer-range missiles to strike targets in Russia.