"I think we might be on the verge of something that would be very, very important for the world at large," Trump's envoy said on Monday.

Conceding that the Russian strongman was “no angel,” Trump refused to directly criticize Putin for the rocket strike in the city of Sumy that killed 35 days on one of the holiest days

The talks come as U.S.-Russia dialogue aimed at agreeing on a ceasefire ahead of a possible peace deal appears to have stalled.