Russia launched the largest single-night drone and missile barrage of the war against Ukraine overnight Monday, deploying nearly 400 Shahed-type drones alongside 23 cruise missiles and 7 ballistic missiles, according to Ukrainian military officials. The strikes hit at least 10 locations across the country, killing at least four people and injuring more than two dozen in regions including Kyiv, Zaporizhzhia, and Kharkiv. Ukrainian air defense forces reported intercepting the majority of incoming drones, though some reached their targets, causing fires and structural damage. Fox News confirmed the scale of the attack, reporting on NATO's immediate response.

Poland scrambled fighter jets and placed its air defenses on the "highest state of readiness" as Russian drones approached its airspace, with the Polish military stating: "Due to the activity of long-range Russian air forces conducting strikes on Ukrainian territory, Polish and allied air forces have begun operating in our airspace." Romania similarly scrambled F-16 fighter jets as drones attacked near the Danube River, which forms part of the Ukraine-Romania border. Both NATO members reported no incursions into their own territory, though the proximity of the strikes to alliance airspace underscored the ongoing risk of the conflict spilling westward.

The Institute for the Study of War characterized the intensified attacks as confirmation that Moscow's long-anticipated spring-summer offensive is now underway. Ukrainian forces reported hundreds of Russian ground assaults along the roughly 750-mile front line in recent days. The barrage occurred as U.S.-brokered peace talks remain stalled — Russia has rejected Ukraine's ceasefire proposals and Ambassador Andrey Kelin threatened "dire consequences" over Ukraine's use of British Storm Shadow missiles, which had struck a microelectronics plant in Russia's Bryansk region. NPR confirmed the diplomatic backdrop, reporting the attack came despite ongoing international pressure for negotiations.

The timing of the massive drone assault coincides with intense U.S. attention on the Iran conflict, raising concerns in Kyiv and among NATO allies about Washington's capacity to sustain its focus on Eastern European security simultaneously. Ukrainian officials characterized the attack as evidence that Russia views the current diplomatic environment as an opportunity to press its military advantage. European governments reiterated calls for continued military support for Ukraine. The Trump administration has not publicly commented on the barrage.