Recent deals with Russia saw the release of 215 Ukrainian prisoners of war. Speaking for the first time to Sky's Sally Lockwood, one former marine tells of being treated "like animals" - stripped, beaten, duct-taped, shocked and humiliated. News correspondent @sallylockwood Please use Chrome browser for a more accessible video player When Ukrainian marine Mikhailo Dianov was released from Russian detention, his photo shocked the world. His body was emaciated after four months as a prisoner of war. When I met him, he was unrecognisable from the photos I'd seen of the well-built fighter in Mariupol, Ukraine. His clothes hung from his frail frame. His gaunt face seemed far older than his 42 years. I had so many questions. Crucially, did you worry you wouldn't survive? "We thought about this every day," Mikhailo tells me. "We first started having those thoughts at the Azovstal steel plant. "At Azovstal we thought it was the end." Ukraine forces Russian troops out of critical town - live up