Ukraine fired six American-supplied longer-range missiles at Russia’s Bryansk region, Moscow said Tuesday, in what would be Kyiv's first use of the weapons inside Russia in 1,000 days of war.

Ukraine fired several American-supplied longer-range missiles into Russia, officials said Tuesday, marking the first time Kyiv used the weapons that way in 1,000 days of war. The use of the Army Tactical Missile System, known as ATACMS, came as Russian President Vladimir Putin formally lowered the threshold for using nuclear weapons, opening the door to a potential nuclear response by Moscow to even a conventional attack by any nation supported by a nuclear power. A Telegram channel affiliated with the Ukrainian military posted a video Tuesday that it says shows U.S.-supplied ATACMS missiles being fired from an undisclosed location in Ukraine.

KYIV, Ukraine — Ukraine fired six American-supplied longer-range missiles at Russia’s Bryansk region, Moscow said Tuesday, in what would be Kyiv’s first use of the weapons inside Russia in 1,000 days of war.