Vladimir Putin has signed an update to Russia's nuclear doctrine, coinciding with the 1,000th day of the war in Ukraine. While the doctrine reaffirms nuclear weapons as a last resort to safeguard Russia's sovereignty,

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.