KYIV, Ukraine (AP) — Russia launched its biggest drone attack against Ukraine overnight, a Ukrainian official said Monday, part of an escalating bombing campaign that has further dashed hopes for a breakthrough in efforts to end the 3-year-old war.

Russian forces launched 114 drones and missiles at Ukraine. Some of the drones were jet-powered, according to the Air Force of the Armed Forces of Ukraine. On the night of May 31, the enemy launched a total of 114 air attack weapons.

Ukraine says Russia launched its biggest drone strike to date after Trump called Putin crazy for stepping up his offensive and "needlessly killing a lot of people."

Russian drones and missiles again bombarded cities across Ukraine on Saturday night into Sunday morning despite the completion of a major prisoner exchange.

Russia-Ukraine peace talks have stalled following hundreds of drone and missile strikes on Ukraine over the weekend. President Trump responded to attacks in a social media post, saying Russian President Vladimir Putin "has gone absolutely CRAZY!

Ukraine and Russia, earlier this month, agreed to exchange 1,000 prisoners of war and civilian detainees each in a rare moment of cooperation in more than three years of war.

Ukraine pioneered the use of small drones on the battlefield. But in Russia’s Kursk region, Moscow’s fiber-optic cables helped turn the tide.

Ukrainian drones launched a night-time attack on Russia's western Kursk region, damaging a hospital and apartment buildings and injuring at least one person, the regional governor said early on Friday.