Russian army officer admits: 'Our troops tortured Ukrainians'

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Allegations of brutal interrogations, where Ukrainian men were shot and threatened with rape, have been made by a former Russian military officer.

Konstantin Yefremov, the most senior officer to speak openly, told the BBC in an exclusive interview Russia now sees him as a traitor and defector.

At one site in southern Ukraine, he said "the interrogations, the torture, continued for about a week".

"Every day, at night, sometimes twice a day."

Mr Yefremov tried to resign from the army numerous times - but he ended up being dismissed for refusing to return to Ukraine. He has now fled Russia.