Russia changes nuclear doctrine, accuses Ukraine of using US weapons to hit territory

President Vladimir Putin has updated Russia’s nuclear doctrine days after President Joe Biden gave Ukraine the approval to use U.S.-provided weapons to hit targets deep into Russian territory.

A key component of Russia’s revised nuclear doctrine, which Putin approved on Tuesday, is that the country would view an act of aggression against Russia or its allies from a non-nuclear state, but with the support of a nuclear country, as a joint attack against themselves.