Mercenary mutiny threatens Putin's power in Russia.

Russian President Vladimir Putin has vowed to punish the organizers of an armed rebellion led by mercenary chief Yevgeny Prigozhin, who spearheaded his troops out of Ukraine and into a key southern city. Prigozhin’s private army appeared to control the military headquarters in Rostov-on-Don, a city 660 miles south of Moscow that runs Russian operations in Ukraine. Putin denounced the uprising as “a stab in the back” in an address to the nation. The rebellion marks an escalation in Prigozhin's struggle with Russian military leaders, whom he accused of botching the war in Ukraine and hobbling his forces in the field.