MOSCOW, August 27. /TASS/. The chief of the self-proclaimed Donetsk republic's military police claimed the Ukrainian side has tortured Donetsk republic’s servicemen while they were held captive.

"A medical examination of Donetsk prisoners revealed that all captives were tortured, one of them had a heart attack," Viktor Anosov said.

On Wednesday evening Kiev handed 12 prisoners to Donetsk under the prisoner swap program envisaged by the Minsk agreements. The Donetsk People’s Republic has handed 11 captives to the Ukrainian side on Thursday morning. One of the 12 soldiers refused to return to Ukraine.

Prisoner exchanges in the ‘all for all’ format are one of the key provisions of the Minsk agreements signed in the Belarusian capital on February 12 after marathon talks between the leaders of Russia, Germany, France and Ukraine.