Putin denounces armed rebellion by mercenary chief as treasonous.

The head of the Wagner mercenary group, Yevgeny Prigozhin, has threatened to topple Russia's military leadership, accusing Moscow of launching a deadly military strike on his troops. Russian President Vladimir Putin has pledged to take "decisive actions" to halt the apparent armed rebellion, which he described as a "stab in the back of our country and our people." It's not clear if Prigozhin is trying to stage a wider coup or just force a change at the top of Russia's military. The Wagner group is a private military army that's been fighting alongside Russia's regular army in Ukraine.