Yevgeny Prigozhin, the leader of the Wagner Group, claims his fighters crossed the Ukraine-Russia border into Rostov-on-Don.
Prigozhin threatens to destroy anyone who opposes his forces.
Tension between the Wagner Group and the Russian military has been escalating.
Prigozhin accuses the Russian military of launching a deadly missile strike on his troops without evidence.
Authorities deny the strike and deem Prigozhin's actions illegal.
ecurity measures are heightened in Rostov-on-Don and the Lipetsk region.
The international community, including the United States, closely monitors the situation.
The Wagner Group is a private army fighting alongside the Russian military in Ukraine.
A peaceful resolution is sought to de-escalate the conflict.
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