Today, we explain why an armed revolt in Russia, led by the Wagner mercenary group, represents one of the biggest challenges to Vladimir Putin’s 23 years of rule. Read more:A fast-moving crisis unfolded in Russia over the weekend: A group of mercenary soldiers, known as the Wagner Group, marched toward Moscow, getting within 120 miles of Russia’s capital before abruptly turning back. Although the rebellion was short-lived, it raises serious questions about Vladimir Putin’s grip on Russia and his war effort in Ukraine. Today, national security reporter Shane Harris explains why Wagner Group leader Yevgeniy Prigozhin led the revolt and what it could mean for Putin’s political future. If you want to learn more about Yevgeniy Prigozhin and the Wagner Group, you can listen to our earlier episode explaining the rise of the shadowy Russian mercenary network.