President Joe Biden has given Ukraine the go-ahead to use American weaponry to strike inside Russia for the limited purpose of defending Kharkiv, according to two U.S. officials familiar with the matter.

The officials underscored that the U.S. policy calling on Ukraine not to use American-provided long-range missiles and other munitions to strike inside Russia offensively has not changed.

The move comes as Ukrainian officials have stepped up calls on the U.S. administration to allow its forces to defend itself against attacks originating from Russian territory.

Biden’s decision was first reported by POLITICO.

This is a developing story. Check back later for updates.