The visit came as the war in Ukraine enters its third month with no end in sight, many thousands of people dead, millions having become refugees, and cities reduced to rubble.
US Secretary of State Antony Blinken has visited Kyiv, according to a Ukrainian presidential adviser.
He met President Volodymyr Zelenskyy and was expected to discuss the country’s request for more weapons to repel the Russian invasion.
This is the first visit by a senior US official since Russia invaded Ukraine 60 days ago – and Mr Zelenskyy had announced the planned visit during a news conference in an underground train station on Saturday.