Russian mercenary chief says his forces are rebelling, some left Ukraine and entered Russia city

The owner of the Wagner private military contractor made his most direct challenge to the Kremlin yet on Friday, calling for an armed rebellion aimed at ousting Russia’s defense minister. The security services reacted immediately by calling for the arrest of Yevgeny Prigozhin.

In a sign of how seriously the Kremlin was taking the threat, security was heightened in Moscow and in Rostov-on-Don, which is home to the Russian military headquarters for the southern region and also oversees the fighting in Ukraine.