Who is the head of the mercenary group calling for an armed rebellion in Russia?

The head of the private military contractor Wagner called Friday for an armed rebellion aimed at ousting Russia’s defense minister. Russian security services reacted immediately by opening a criminal investigation into Yevgeny Prigozhin.

He has previously bashed the country's military leadership for failures in the war in Ukraine, and is known for his long-running feud with the Defense Ministry.

A look at the 62-year-old Prigozhin and Wagner’s role in the war: