Someone is then heard saying “you are breaking your own laws” before the video ends.
Two mothers of men in the unit said that 20 soldiers have been detained and are now being held in a cellar ahead of a court martial.
They are thought to be held captive in the Luhansk region for attempting to resign from the army.
Svetlana Yelcheva, the mother of detained soldier Nikita Lazarev, said the unit had been fighting in the war for three and a half months.