U.S.'s Kerry called Russian counterpart to urge truce implementation - official

WASHINGTON (Reuters) - U.S. Secretary of State John Kerry spoke to his Russian counterpart Sergei Lavrov on Saturday, urging full implementation of this week's Minsk agreements on ending fighting in Ukraine, including a midnight ceasefire.

Kerry also expressed concern to Lavrov about the fierce fighting around the town of Debaltseve, and efforts by Russia and the separatists to cut off the town in advance of the ceasefire, a senior State Department official said.