Wagner Group
If inmates served with the Wagner Group mercenaries, they will be able to return to Russian society.
It comes after the mercenary outfit suffered major losses in Ukraine.
Yevgeny Prigozhin says ammunition he was promised has not arrived.
They have been nicknamed Vladimir Putin's private army.
It comes as Moscows is expected to launch a new offensive to mark one-year since it first invaded Ukraine.
The troops are "threatened with summary execution" if they fail to follow orders.