The team, led by US Army Secretary Dan Driscoll, is expected to meet Ukrainian President Volodymyr Zelensky in Kyiv on Thursday when he returns from a trip to Turkey.
Reports began surfacing on Wednesday that the US and Russia had prepared a new peace plan, containing major concessions from Ukraine. Neither Washington nor Moscow has officially confirmed the plan.
Earlier in the day, at least 26 people were killed in a Russian missile and drone attack on Ukraine's western city of Ternopil, officials there said. Russia launched a full-scale invasion of Ukraine in 2022.
