Russia's Wagner mercenary group appeared on Sunday to ditch plans to withdraw from Bakhmut in eastern Ukraine, saying they had been promised more arms by Moscow and suggesting they may keep up their assault on what Russia sees as a stepping stone to other cities in the Donbas region.

Ukraine's general in charge of the defense of the besieged city said late Sunday that Russia had intensified shelling, hoping to take Bakhmut by Tuesday, but he vowed to do everything to prevent it. May 9 is Victory Day in Russia, marking the anniversary of the defeat of Nazi Germany in World War II.

Elsewhere, Ukrainian and Russian media reported explosions across Russian-occupied Crimea, and a blast was reported overnight in the Black Sea city of Odesa. Russia's Defense Ministry said its air defenses had detected and destroyed 22 Ukrainian drones over the Black Sea overnight.