Cluster munitions in Ukrainian hands, being deployed in field -White House

FILE PHOTO: Dozens of 155mm Base Burn Dual Purpose Improved Conventional Munitions (DPICM) rounds wait to be loaded at a U.S. Army motor pool at Camp Hovey, South Korea September 20, 2016. U.S. Army/2nd Lt. Gabriel Jenko/Handout via REUTERS/File Photo

WASHINGTON (Reuters) - U.S.-supplied cluster munitions are in Ukrainian hands and being deployed in the field as part of Kyiv's battle against Russia, White House national security spokesman John Kirby said on Thursday.

"We have gotten some initial feedback from the Ukrainians, and they're using them quite effectively," Kirby said at a news briefing.