Ramzan Kadyrov, the leader of Chechnya, said he was in Ukraine alongside invading Russian forces.
Kadyrov, who is accused by international NGOs of serious human rights abuses in the tightly controlled Caucasus republic, posted a video on Telegram of himself in military uniform studying plans around a table in a room with soldiers.
He said in a message that the video was shot at Hostomel, an airfield near Kiev captured by Russian forces in the early days of their offensive. The claim could not be independently verified.
“The other day we were about 20 km from you Kiev Nazis, and now we are even closer,” Kadyrov wrote. He called on Ukrainian forces to surrender “or you’ll be finished”.
“We will show you that Russian practice teaches war better than foreign theory and the recommendations of military advisers,” he added.
Kadyrov, who rules the Russian republic of Chechnya with an iron fist, is a former rebel turned Kremlin ally with a paramilitary force at his command.
At the start of the Russian offensive, images circulated on social media showing a square in the Chechen capital, Grozny, filled with soldiers claiming to be on their way to Ukraine.