Moscow says more than 1,700 surrender

• Ukrainian officials mum on fate of soldiers as talks under way to free them

Moscow said on Thursday that 1,730 Ukrainian fighters surrendered in Mariupol over three days, including 771 in the past day, claiming a bigger surrender than the one Kyiv mentioned when telling its troops to stand down.

The final outcome of Europe’s bloodiest battle for decades remained publicly unresolved, with no confirmation of the fate of the hundreds of Ukrainian troops who held out in a vast steelworks at the end of a near three-month siege.

Ukraine, which says it aims to secure a prisoner swap, declined to say how many were in the plant or comment on the fate of the rest, since saying that just more than 250 surrendered in the initial hours after it ordered them to yield.

The leader of Russianbacked separatists in control of the area said nearly half of the fighters remained inside the steelworks, where underground bunkers and tunnels had protected them from weeks of Russian bombardment.

“More than a half have already left — more than half have laid down their arms,” Denis Pushilin told the Solovyov Live internet television channel. “Let them surrender, let them live, let them honestly face the charges for all their crimes.”

The wounded had been given medical treatment, while those who were fit had been taken to a penal colony and were being treated well, he said.

Ukrainian officials say they cannot comment publicly on the fate of the fighters, as negotiations are under way behind the scenes to free them.

“The state is making utmost efforts to carry out the rescue of our service personnel,” military spokesperson Oleksandr Motuzaynik said.

“Any information to the public could endanger that process.”

Russia denies that it agreed to a prisoner swap. Many of the Azovstal defenders belong to a Ukrainian unit with far-right origins, the Azov Regiment, which Moscow calls Nazis and says must be prosecuted for crimes. Ukraine calls them national heroes.

The end of fighting in Mariupol, the biggest city Russia has captured so far, allows Russian President Vladimir Putin to claim a rare victory in the invasion that he launched on February 24.

This gives Russia complete control of the Sea of Azov and an unbroken stretch of territory along eastern and southern Ukraine.

Ukraine says tens of thousands of civilians died in nearly three months of Russian bombardment that flattened the city. The Red Cross and the UN say the true toll is uncounted but is at least in the thousands, making it the bloodiest battle in Europe at least since the Chechnya and Balkan wars of the 1990s.

Moscow denies targeting civilians in its “special military operation” to disarm and “denazify” its neighbour. Ukraine and the West say Russian forces have killed many thousands of civilians in an unprovoked war of aggression.

Russian forces were driven from northern Ukraine and the area around the capital at the end of March, and were pushed this month from the outskirts of the second-largest city Kharkiv by a Ukrainian counteroffensive.

On Thursday, the crash of artillery duels resounded across sun-lit fields and woodlands north of Kharkiv near the village Slatyne.

Ukrainian troops pressing on with their advance said fighting was under way around the nearby village of Demetiivka, which the Ukrainian military said was recaptured the previous day, only about 8km from the Russian border. Vitalyi, a military ambulance driver, had parked his vehicle, which he had christened “Angel”, under cover to avoid being spotted.

“Drones are always a big problem, during the day as well as at night,” he said. “Because after the drones, come the shells.”

In a sign of the return of normal life in the capital, the US reopened its embassy on Wednesday. “The Ukrainian people ... have defended their homeland in the face of Russia’s unconscionable invasion, and, as a result, the stars and stripes are flying over the embassy once again,” said secretary of state Antony Blinken.

But, Russia is still pressing its main offensive using massed artillery and armour, trying to capture more territory in the eastern Donbas, comprising the Donetsk and Luhansk regions, which Moscow claims on behalf of separatists.

Ukraine’s general staff said Russia’s attacks were focused on Donetsk. Russian forces “suffered significant losses” around Slovyansk to the north of Donetsk.

Police said two children were killed in the Donetsk city of Lyman. Serhiy Gaidai, governor of the neighbouring Luhansk region, said four people were killed and three wounded in shelling of the front-line city of Sievierodonetsk.