Senior Ukrainian officials visited Washington on Tuesday seeking U.S. support against Russia, as Kyiv showed its ability to fight on by setting off an explosive device under a bridge that has become a symbol of the Kremlin's claims on Ukrainian territory.

Russian forces have continued to advance in the northern Ukrainian region of Sumy, bringing the region’s capital within range of their drones and artillery, according to Ukrainian officials and analysts.

A Russian artillery attack on Ukraine's northeastern city of Sumy on Tuesday killed four people and injured 28, including three children, officials said. President Volodymyr Zelenskiy announced the updated death toll of four in the city in his nightly video address.