tl;dr:

The move came not long after the Kremlin accused Mr Prigozhin of calling for armed mutiny. Wagner fighters had entered the southern Russian city of Rostov, Mr Prigozhin said in an audio recording posted on Telegram. Earlier, Mr Prigozhin escalated his direct challenge to the Kremlin, calling on Friday for an armed rebellion aimed at ousting Russia’s defence minister. Mr Prigozhin posted a series of angry video and audio recordings in which he accused Defence Minister Sergei Shoigu of ordering a rocket strike on Wagner’s field camps in Ukraine, where his troops are fighting on behalf of Russia. The White House is monitoring the situation involving Russia and the Wagner force, and will be consulting with allies and partners on developments, National Security Council spokesperson Adam Hodge said on Friday, after Moscow accused Mr Prigozhin of armed mutiny.

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lol, The Wagner Group has invaded Russia and annexed the city of Rostov completely, and is rolling unimpeded (After shooting down a Russian Air Froce helicopter) to Moscow