A key concern, according to experts, is if Prigozhin's rebel forces seek to gain control of any of Russia's nuclear armory, particularly tactical nuclear weapons.
"This is an emerging danger and is exactly what policymakers most fear, a loose-nuke scenario," wrote Alexander Vindman, a former White House National Security Council expert on Russia and Eastern Europe.
"This fear has plagued US policymakers since the collapse of the Soviet Union," he said.
The White House did not respond when asked if there had been any communications with Moscow over the security of its nuclear weaponry.
