But as Ukraine prepares to meet with U.S. officials, Ukrainian soldiers say they are bracing for attacks to take advantage of a pause in U.S. intelligence.

At least 11 people were killed and 30 injured in a Russian strike on Dobropillya, a town in eastern Ukraine's Donetsk region, Ukrainian authorities say. Eight residential buildings and an administrative building were damaged in the attack late Friday, the regional emergency service reported. The town lies north-west of Russian-held Donetsk city.