Russia pounded Ukraine with deadly missiles and drone strikes in a sweeping attack that the U.S. special envoy on Ukraine said undermined President Donald Trump's peace efforts.

At least 23 people were killed in the capital early on Thursday, Tymur Tkachenko, head of Kyiv's military administration, said on Telegram. As of 11 p.m., rescue efforts were still underway.

White House Press Secretary Karoline Leavitt said Trump "was not happy about this news, but he was also not surprised," given that the two countries had been at war for a long time.