KYIV/LVIV: More than 1,000 Ukrainian marines have surrendered in the port of Mariupol, Russia’s defence ministry said on Wednesday, signalling that it had moved closer to capturing the ruined city, its main strategic target in eastern Ukraine.

If the Russians take the Azovstal industrial district, where the marines have been holed up, they would have full control of Mariupol, Ukraine’s main Sea of Azov port, reinforcing a southern land corridor before an expected new offensive in the country’s east.

Surrounded and bombarded by Russian troops for weeks and the focus of some of the fiercest fighting in the war, Mariupol would be the first major city to fall since Russia invaded Ukraine on Feb. 24.

Russia’s defence ministry said 162 officers were among the marines who had surrendered to Russian and pro-Russian separatist forces.

“In the town of Mariupol, near the Ilyich Iron and Steel Works, as a result of successful offensives by Russian armed forces and Donetsk People’s Republic militia units, 1,026 Ukrainian soldiers of the 36th Marine Brigade voluntarily laid down arms and surrendered,” the ministry said in a statement.

Ukraine’s general staff said Russian forces were proceeding with attacks on Azovstal and the port, but a defence ministry spokesman said he had no information about any surrender.

Reuters journalists accompanying Russian-backed separatists saw flames billowing from the Azovstal area on Tuesday.

On Monday, Ukraine’s 36th Marine Brigade said it was preparing for a final battle in Mariupol that would end in death or capture as its troops had run out of ammunition.

Tens of thousands of people are believed to have been killed in Mariupol and Russia has been massing thousands of troops in the area for a new assault, Ukrainian President Volodymyr Zelenskiy said.

“We have destroyed more Russian weapons and military equipment than some armies in Europe currently possess. But this is not enough,” he said in a social media video, reiterating calls for tanks, fighter jets, and missile systems.

Ukraine accuses Russia of blocking aid convoys to tens of thousands of civilians it says are still trapped in Mariupol.

Chechen leader Ramzan Kadyrov, an ardent supporter of Russian President Vladimir Putin, urged remaining Ukrainians holed up in Azovstal to surrender.

“Within Azovstal at the moment there are about 200 wounded who cannot receive any medical assistance,” Kadyrov said in a Telegram post. “For them and all the rest it would be better to end this pointless resistance and go home to their families.”

Russian television showed pictures of what it said were marines giving themselves up at Illich Iron and Steel Works in Mariupol on Tuesday, many of them wounded.