In his nightly video address, Ukrainian President Volodymyr Zelensky said that by storming the steel mill, Russian forces violated agreements for safe evacuations. He said the prior evacuations are “not a victory yet, but it's already a result. I believe there's still a chance to save other people.”
In other battlefield developments, Russian troops shelled a chemical plant in the eastern city of Avdiivka, killing at least 10 people, Donetsk regional governor Pavlo Kyrylenko said.
“The Russians knew exactly where to aim - the workers just finished their shift and were waiting for a bus at a bus stop to take them home,”
Explosions were also heard in Lviv, in western Ukraine, near the Polish border. The strikes damaged three power substations, knocking out electricity in parts of the city and disrupting the water supply, and wounded two people, the mayor said. Lviv has been a gateway for NATO-supplied weapons and a haven for those fleeing the fighting in the east.
A rocket also struck an infrastructure facility in a mountainous area in Transcarpathia, a region in far western Ukraine that borders Poland, Hungary, Romania and Slovakia, authorities said. There was no immediate word of any casualties.
Russian Defense Ministry spokesman Maj. Gen. Igor Konashenkov said Russian aircraft and artillery hit hundreds of targets in the past day, including troop strongholds, command posts, artillery positions, fuel and ammunition depots and radar equipment.
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Ukrainian authorities said the Russians also attacked at least a half-dozen railroad stations around the country.
The assault on the Azovstal steelworks began almost two weeks after Russian President Vladimir Putin ordered his military not to storm the plant to finish off the defenders but to seal it off. The first - and so far only - civilians to be evacuated from the shattered plant got out during a brief cease-fire in an operation overseen by the UN and the Red Cross.
Tsybulchenko rejected Russian allegations that the Ukrainian fighters wouldn't allow civilians to leave the plant. She said the Ukrainian military told civilians that they were free to go but would be risking their lives if they did so.
“We understood clearly that under these murder weapons, we wouldn't survive, we wouldn't manage to go anywhere,” she said.
Mariupol has come to symbolize the human misery inflicted by the fighting. The Russians' two-month siege of the strategic southern port has trapped civilians with little or no food, water, medicine or heat, as Moscow's forces pounded the city into rubble. The plant in particular has transfixed the outside world.
Russian forces Tuesday began storming the steel mill containing the last pocket of resistance in Mariupol, Ukrainian defenders said, just as scores of civilians evacuated from the bombed-out plant reached relative safety and told of days and nights filled with dread and despair from constant shelling.
Osnat Lubrani, the UN humanitarian coordinator for Ukraine, said that thanks to the evacuation effort over the weekend, 101 people - including women, the elderly, and 17 children, the youngest six months old - were able to emerge from the bunkers under the Azovstal steelworks and “see the daylight after two months.”
The news for those left behind was grimmer. Ukrainian commanders said Russian forces backed by tanks began storming the sprawling plant, which includes a maze of tunnels and bunkers spread out over 11 square kilometres.
How many Ukrainian fighters were holed up inside was unclear, but the Russians put the number at about 2,000 in recent weeks, and 500 were reported to be wounded. A few hundred civilians also remained there, Ukrainian Deputy Prime Minister Iryna Vereshchuk said.
He added that throughout the night, the plant was hit with naval artillery fire and airstrikes. Two civilian women were killed and 10 civilians wounded, he said.
The UN's Lubrani expressed hope for further evacuations but said none had been worked out.
After failing to take Kyiv in the early weeks of the fighting, Russia withdrew from around the capital and announced that its chief objective was the capture of Ukraine's eastern industrial heartland, known as the Donbas.
Mariupol lies in the region, and its fall would deprive Ukraine of a vital port, allow Russia to establish a land corridor to the Crimean Peninsula, which it seized from Ukraine in 2014, and free up troops for fighting elsewhere in the Donbas.
But so far, Russia's troops and their allied separatist forces appear to have made only minor gains in the eastern offensive.
Ukraine's resistance has been significantly bolstered by Western arms, and British Prime Minister Boris Johnson announced 300 million pounds ($375 million) in new military aid, including radar, drones and armored vehicles.
In a speech delivered remotely to Ukraine's parliament, he pronounced the battle Ukraine's “finest hour,” echoing the words of Winston Churchill during World War II.
“Your children and grandchildren will say that Ukrainians taught the world that the brute force of an aggressor counts for nothing against the moral force of a people determined to be free,” Johnson said.