U.S. President Joe Biden has quietly authorized Kyiv to launch U.S.-supplied weapons at military targets inside Russia that are supporting an offensive against the northeastern Ukrainian city of Kharkiv, four U.S. officials said on Thursday.

The decision marks a policy shift by Biden, who had steadfastly refused to allow Ukraine to use American weaponry for strikes inside Russia.

Russia¡¯s embassy in Washington and Russia¡¯s mission to the United Nations in New York did not immediately respond to a request for comment.