He has criticized Russia' war strategy, saying on Sunday that Russia is sleepwalking toward defeat.
Girkin, who is also known by his alias "Strelkov," is now a prominent war blogger who has criticized the Russian military strategy in Ukraine.
"I'm not afraid to say that we are heading towards military defeat," Girkin said, adding that the Russian economy, military, and political system were unprepared for such a "long, protracted war."
In February, Girkin criticized Russian President Vladimir Putin's national address about the war with Ukraine for blatantly ignoring Moscow's "failures" and "defeats."
In October 2022, Ukrayinska Pravda reported that Girkin was believed to be fighting for Russia in Ukraine.