Ukraine Mounts Counteroffensive to Drive Russians Back From Kyiv, Key Cities

Ukrainian President Volodymyr Zelensky urged the U.S. Congress to provide more weapons and increase economic pressure on Russia hours after Ukraine said its military had launched a counteroffensive in its capital, Kyiv, and other key cities.

Mr. Zelensky, in a virtual address to members on Wednesday, thanked the U.S. for its support as Ukraine tries to fend off Russia’s invasion, but he added, “In the darkest time for our country, for the whole of Europe, I call for you to do more.”

He renewed his appeal for a no-fly zone and added that,...