U.S. Deputy Representative to the United Nations Tammy Bruce has condemned Russia's massive attacks on Kyiv as an "inexplicable, dangerous, and barbaric escalation" and called for an immediate ceasefire and peace negotiations.

She said this during a UN Security Council meeting on the escalation of Russian attacks against Ukrainian civilians, according to Ukrinform's correspondent in New York.

Bruce said the strikes, including the reported use of Oreshnik ballistic missiles, had killed civilians and injured more than 100 people.

"The latest mass strikes against Kyiv by Russia over the weekend, including the deployment of the Oreshnik hypersonic ballistic missiles, are an inexplicable, dangerous, and barbaric escalation," Bruce said, adding that museums, public transportation infrastructure, residential buildings, and other civilian facilities had been destroyed or damaged during the attacks.

"Deliberate attacks against civilians are obscene and unacceptable," Bruce said, expressing condolences to the victims.