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They were marched away from the front to a Ukrainian armoured vehicle and taken as prisoners of war.

This attack follows the start of a prisoner swap on Monday that will see sick and heavily wounded prisoners of war, those under the age of 25 and the bodies of 12,000 soldiers returned.

Russia said a "similar number" of prisoners of war had been returned to Ukraine, though neither side provided an exact figure for how many people had been exchanged.

In May, Russia released 120 civilian detainees as part of a larger swap of prisoners of war, and further exchanges are expected.

A second round of peace talks between Russia and Ukraine have ended without a major breakthrough, and only an agreement between the warring sides to swap more prisoners of war.