Moscow said its military launched a “massive strike” against Ukraine overnight, including a nuclear-capable missile, calling the attack retaliation for an unverified claim of a Ukrainian assault on a residence belonging to Russian President Vladimir Putin.

The Oreshnik ballistic missile struck the Lviv region, near the eastern border of the EU and NATO, Ukrainian Foreign Minister Andrii Sybiha wrote in a post on X, saying the strike represents “a grave threat to the security on the European continent.”

The strike marks only the second known combat use of the hypersonic Oreshnik missile, which is capable of carrying nuclear weapons, following its first firing against the Ukrainian region of Dnipro in November 2024. The strike on the Lviv region was part of a wider Russian barrage across Ukraine.

Russia’s defense ministry said the assault was retaliation for an alleged Ukrainian attack on Putin’s residence on Dec. 29 — a claim that Kyiv has denied.

“It is absurd that Russia attempts to justify this strike with a fake ‘Putin residence attack’ that never happened,” Ukraine’s Sybiha said on X. “This is further proof that Moscow does not need real reasons for its terror and war.”

Ukraine’s Western Air Command said in a Facebook post that the intermediate-range Oreshnik missile was traveling at approximately 13,000 kilometers per hour, with social media reports indicating the strike occurred only minutes after air-raid sirens sounded.

The Lviv regional military administration said specialists conducted on-site tests and laboratory analyses following the strike.

“The radiation background is within normal limits,” they said, adding that no harmful substances were detected in the air.

Sybiha announced that Ukraine will be calling for an urgent United Nations Security Council meeting in response to the strike.

“Such a launch near the borders of the EU and NATO is a serious threat to security on the European continent and a test for the transatlantic community,” Sybiha wrote. “We demand a decisive response to Russia’s reckless actions.”