Ukraine hit a Russian weapons arsenal with US-made ATACMS missiles that it fired across the border for the first time, according to two US officials, in a major escalation on the 1,000th day of war. The attack comes just two days after the Biden administration gave Kyiv the green light to use the longer-range American weapons against targets inside Russia.

In a major policy shift, the Biden administration has authorized Ukraine to use the ballistic missiles within Russia.

Ukraine has fired six ATACMS into Russia, marking the first attack using the U.S.-made long-range missiles in 1,000 days of war.