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Top-ranking commanders have not yet surrendered from the labyrinth of bunkers and tunnels below the steel works in , the leader of the Russian-backed separatist region of Donetsk said on Wednesday.

As the most devastating siege in Russia's brutal invasion moves towards a finale, nearly 1,000 Ukrainian fighters who barricaded themselves into the tunnels have so far given themselves up to Russian and pro-Russian forces since Monday.

Russia's defence ministry said that in the past day 694 Ukrainian fighters - including members of the Azov regiment - had surrendered, including 29 wounded.

It was unclear if the top commanders would leave the plant, or possibly even fight a last mortal battle with the Russian forces occupying Ukrainian territory.

"There are no commanders of the highest level [among those who surrendered]Ìý- they have not left," said Denis Pushilin, head of the breakaway Donetsk People's Republic (DPR).

"That is - so far," Pushilin, who along with Russian forces controls Mariupol, was quoted as saying by the Donetsk News Agency, known as DAN.

The DPR is not accepted by the international community but Russia'sÌýPresident Vladimir Putin recognised it just three days before the invasion of Ukraine.

It was unclear what would happen to the fighters who were cast by Ukrainian President Volodymyr Zelensky as heroic resistance fighters but who Russian lawmakers claimed were "Nazi criminals" who should face the gravest punishment, even death.

Courts

Pushilin said the fate of the surrendered Ukrainian fighters would be decided by the courts.

"As for war criminals as well as those who are nationalists, their fate, if they laid down their arms, should be decided by the courts," he said. "If the enemy has laid down arms, then his fate will be decided by the courts. If it is a Nazi criminal, then it's a tribunal."

Moscow says the Azov Battalion,Ìýwhich began as an extreme-right nationalist paramilitary organisation, is a group of radically anti-Russian nationalist fighters and casts them as modern-day Nazi sympathisers.

The regiment, formed in 2014 as a militia to fight Russian-backed separatists, denies being fascist, racist or neo-Nazi, and Ukraine says it has been reformed away from its radical nationalist origins to be integrated into the National Guard.

A number of civilians who were sheltering in the Azovstal steel plant were evacuated this month with the help of the International Committee of the Red Cross and the United Nations. Turkey's proposal included evacuating the civilians who were still there

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President Vladimir Putin claimedÌýwhat he callsÌýisÌýa special military operation was necessary in Ukraine to prevent the persecution of Russian speakers and to prevent the United States using Ukraine to threaten Russia.

Ukraine says Putin is trying to steal the country and denies that Kyiv persecuted Russian speakers.

The Kremlin said the combatants would be treated in line with international norms.

has said there will be a prisoner of war exchange.

Civilians who sheltered in the bunkers spoke of desperate conditions there.

Some of the fighters endured horrific battle injuries.

(Reuters)