Moscow says Ukraine fired six U.S.-supplied long-range missiles into Russia for the first time today. The Russian Ministry of Defense says Ukraine used the Army Tactical Missile System, known as ATACMS, in the strike on Russia’s Bryansk region. This comes after President Biden gave Ukraine the green light to begin striking inside Russia and as Russian President Vladimir Putin signed a decree lowering the threshold for the use of nuclear weapons. The revised nuclear doctrine states that any attack on Russia by a nation backed by a nuclear power will be considered a joint attack on Russia. It also allows for Russia’s use of nuclear weapons in response to aggression against allies, including Belarus. On Monday, British Prime Minister Keir Starmer also signaled Britain will supply long-range Storm Shadow cruise missiles to Ukraine for attacks on Russian soil.

Separately, a Russian missile attack on Ukraine’s Black Sea port city of Odesa Monday killed 10 people and wounded 44 others. Four children were among the wounded in the attack, which struck a residential neighborhood.