The United States is accusing Russia of a “dangerous and inexplicable escalation” of the nearly four-year war in Ukraine at a time when the Trump administration is trying to advance negotiations toward peace.

At least four people have been killed in Russia's most intense overnight aerial bombardment of the year so far, according to Ukrainian officials and media. Ukraine’s capital Kyiv came under a short but intense attack from Russian missiles, head of Kyiv’s military administration Tymur Tkachenko said.

It is only the second time Moscow has deployed the hypersonic ballistic missile, which was first used to hit Dnipro in November.

Russia has used its latest missile against Ukraine for a second time in the nearly 4-year-old war, a forceful signal to Kyiv and its Western allies as peace talks are in a crucial stage.

Russia's defence ministry said on Monday that the target it hit last week in a strike with a hypersonic Oreshnik missile was a Ukrainian aircraft repair plant, which was disabled. Ukraine and its European backers condemned the Russian missile strike on Friday,

Ukraine said the "Geran-5" bears similarities to Iran's Karrar attack drone, and uses a more powerful engine than Russia's current turbojet Shaheds.

A Ukrainian drone strike killed one person and wounded three others in the Russian city of Voronezh, local officials said Sunday. Meanwhile, thousands of residents were still without power in Kyiv, following an intense Russian bombardment.

Read the latest news on Russia’s invasion of Ukraine. Stay updated with on-the-ground reporting, political developments on both sides, and the economic impact on the region and the world.