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.

Ukrainian authorities reported multiple deaths and infrastructure damage after Russia said it deployed a new missile system in an overnight strike.

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 fired its new Oreshnik intermediate-range ballistic missile at the western Ukrainian city of Lviv overnight on Jan. 9, the Russian Defense Ministry said, calling the attack "retaliation" for an attempted Ukrainian drone strike on one of President Vladimir Putin's residences, a claim Kyiv has denied.

The death of the last treaty capping the size of the Russian and U.S. nuclear arsenals could spark a new atomic arms race threatening the globe’s eight billion citizens.

The United States accused Russia of "dangerous and inexplicable escalation" after new attacks on Ukraine's energy and civilian infrastructure.

Russia launched a second major drone and missile bombardment of Ukraine in four days, officials said Tuesday, aiming again at the power grid and apparently snubbing U.S.-led peace efforts as the war approaches the four-year mark.

It’s a freezing morning in Ukraine with extreme temperatures below -15°C (5°F). And that is precisely why Russia launched an overnight attack on Ukraine, using more than 300 drones, 18 ballistic missiles and 7 cruise missiles,