Russia asked China to give it military equipment and support for the war in Ukraine after Russian President Vladimir Putin began a full-scale invasion last month, according to U.S. officials.

Russia has also asked China for additional economic assistance, to help counteract the battering its economy has taken from broad sanctions imposed by the United States and European and Asian nations, according to an official.

U.S. officials, determined to keep secret their means of collecting the intelligence on Russia’s requests, declined to describe further the kind of military weapons or aid that Moscow is seeking. The officials also declined to discuss any reaction by China to the requests.