tl;dr:

The Wagner group is a private military army that's been fighting alongside Russia's regular army in Ukraine, but tensions over how the war has been fought have been building for months. Putin has appeared to acknowledge that Russia's military has lost control of Rostov-on-Don and there are indications Wagner fighters have moved north to Voronezh, about 320 miles from Moscow. Ukrainian officials declined to comment directly on whether Prigozhin was leading an insurrection against Putin. U.S. officials observing the chaos unfolding in Russia Saturday have reached few conclusions about the rupture between Putin and Prigozhin. Prigozhin, 61, is the head of the Wagner mercenary group, a paramilitary organization that was supporting the Russian government in its war against Ukraine before Prigozhin apparently turned against Russia's military.

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