New York, New York - The US on Monday decried Russia's use of a nuclear-capable Oreshnik ballistic missile in Ukraine, calling it an "inexplicable escalation" during an emergency meeting of the UN Security Council.

Russia's use Friday of the intermediate-range missile, which was not carrying a nuclear warhead, "constitutes another dangerous and inexplicable escalation of this war, even as the United States is urgently working with Kyiv, other partners and Moscow to end the war through a negotiated settlement," US Deputy UN Ambassador Tammy Bruce said.

"We condemn Russia's continuing and intensifying attacks on Ukraine's energy facilities and other civilian infrastructure," Bruce continued.

Moscow on Monday said the missile hit an aviation repair factory in the Lviv region, in western Ukraine, and that it was fired in response to Ukraine's attempt to strike one of Russian President Vladimir Putin's residences – a claim which Kyiv denies.

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Ukraine confirmed the missile was fired on the Lviv region, close to the border with Poland, but did not say whether the plant was struck.

Acting British ambassador James Kariuki called the attack "reckless," adding that "it threatens regional and international security and carries significant risk of escalation and miscalculation."