Officials say Sumy's hospital was hit in the morning, and was struck again as rescuers were evacuating people.

President Vladimir Putin warned the West on Wednesday that Russia could use nuclear weapons if it was struck with conventional missiles, and that Moscow would consider any assault on it supported by a nuclear power to be a joint attack.

It remains uncertain whether the U.S. will allow Ukraine to strike deep into Russian territory using American-made weapons, which is a critical component of Zelenskyy's strategy. On Sept. 27, Zelenskyy met with former President Trump,