The long-range missiles provided by the United States and Britain were used to strike inside Russian territory, despite concerns that their use would escalate the conflict. Kyiv’s stockpiles are running out.

Russia's point man for arms control cautioned Donald Trump's incoming administration on Friday against resuming nuclear testing, saying Moscow would keep its own options open amid what he said was Washington's "extremely hostile" stance.

"Ukraine was brutally attacked on Christmas Day," said Keith Kellogg, President-elect Donald Trump's pick for Ukraine and Russia envoy.

President Biden on Wednesday denounced Russia’s latest attack on Ukraine, declaring the wave of missiles and drones “outrageous.” “The purpose of this outrageous attack was to cut off the Ukrainian people’s access to heat and electricity during winter and to jeopardize the safety of its grid,

Overnight, Russia launched 10 drones from Crimea and six S-300/S-400 missiles from Russia's Belgorod Oblast, targeting the Kursk and Sumy oblasts, Ukraine’s Air Force reported.