Russia fired a hypersonic Oreshnik missile at a target in western Ukraine overnight Thursday, near the border with NATO member Poland, in what has been labeled a brazen “warning” to the wider continent and the United States.

Russia said Friday it 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 U.S.-led peace talks have entered a new and crucial stage.

Moscow said the overnight strike was in response to an alleged Ukrainian drone strike on a residence used by President Vladimir Putin, which the U.S. and others said did not happen.

Russia bombarded Ukraine with hundreds of drones and dozens of missiles in a large-scale overnight attack, officials said Friday, killing at least four people. For only the second time, it used a new ballistic missile that it says flies at 10 times the speed of sound and is unstoppable.

The UAV, which bears a resemblance to the Iranian-designed Karrar drone, utilizes the Telefly jet engine, though with a greater thrust than the Geran-3 model, according to HUR.

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

Ukraine's commander in chief said December was the first month that its drones "neutralized" roughly as many Russians as were called up.

For only the second time, Russia used a new ballistic missile that it says flies at 10 times the speed of sound and is unstoppable by air defenses.

Russia attacked Ukraine with a new hypersonic ballistic missile in what appeared to be a threatening message to Kyiv and the West. Russia said the “massive strike” was in response to an alleged Ukrainian drone strike on a residence used by President Putin,

Kyiv's water and heating systems were back on after being briefly shut down amid intense cold on Saturday, as engineers scrambled to stabilize a power grid brought to the brink by a campaign of Russian strikes,