According to military bloggers, the systems are able to carry multiple independently targetable nuclear warheads and can be mounted on a truck carrier or deployed in silos.
The months-long struggle for Bakhmut has seen some of the bloodiest attritional fighting of Russia's year-old invasion.
Russian prison supervisors said that just two weeks ago, Navalny's health was not in danger.
Russian leadership claims Ukraine did not hold up their end of the bargain in Orthodox Christmas ceasefire.
State Department spokesman Ned Price condemned the practice of recruiting convicted criminals for battle in exchange for freedom if they are willing to fight, calling it a "barbaric tactic."