Russia trying but unable to impede weapons flow to Ukraine, US official says

Russia is trying but has been unable to target Western weapons flowing into Ukraine, including longer-range systems that Kyiv hopes will be decisive on the battlefield, a senior U.S. defense official said on Friday.

The official also appeared to play down the significance of Russian advances in Ukraine and said a Ukrainian pullback from Sievierodonetsk would allow them to take a better defensive position.

"In moving the Ukrainian armed forces from Sievierodonetsk back, what they are doing is putting themselves in a position where they can better defend themselves," the official said, speaking on condition of anonymity.