The attack on Friday, which killed at least four people nationwide, came two days after Russia vowed retaliation for an audacious drone assault on its strategic bomber bases.

Russia bombarded Ukraine’s second-largest city with massive strikes in the early hours of Saturday, its mayor said, one night after Moscow carried out one of the war’s largest aerial assaults on Ukraine.

The destruction of at least four Tu-95MS bombers and two Tu-160s represents a profound blow to Russia’s strategic bomber fleet and nuclear deterrent posture.” That analysis, from a recent examination of Ukraine’s brazen drone attacks,

Technological advances have given threadbare militaries and rebel fighters the ability to strike stunning blows against far stronger forces.

Russian ballistic missiles have been launched toward Ukraine from multiple directions, the Ukrainian Air Force said on Telegram Friday.

Air defense has been activated in Kyiv amid reports of airstrikes targeting Chernihiv, a city in northern Ukraine, ABC News confirmed.

President Trump said during his phone call with Vladimir Putin that he compared the war in Ukraine to a fight among children, suggesting they ‘fight for a while.’ Trump also said he warned Putin not to retaliate against Ukraine over its recent drone attack on Russian bombers.

Russia will respond to Ukraine's latest attacks as and when its military sees fit, the Kremlin said on Thursday, accusing Kyiv of state terrorism as U.S. President Donald Trump downplayed prospects for an immediate peace between the countries.