Following a pattern of heavy bombardments after Ukrainian battlefield or diplomatic gains, Russia launched 36 missiles in the early hours, Ukraine's Air Force said.
The Russian missiles triggered air-raid sirens and landed across Ukraine, including at the Kremenchuk refinery, where the extent of damage was unclear.
Ukraine said the barrage included three KH-31 missiles and one Oniks anti-ship cruise missile, which its air defences cannot shoot down.
[1/6] Ukrainian servicemen of the 80th Air Assault Brigade fire M119 Howitzer artillery weapon towards Russian troops, amid Russia's attack on Ukraine, near Bahmut, Donetsk region, Ukraine, February 16, 2023.
Its capture would give Russia a stepping stone to advance on two bigger Donetsk cities further west, Kramatorsk and Sloviansk.