Pro-Kremlin Chechen leader Ramzan Kadyrov has claimed spies from his region of Russia are being sent to infiltrate the Islamic State group (ISIS or IS) and assist Moscow in its bombing campaign in Syria.

Kadyrov, who has led the North Caucasus region of Chechnya since 2007, made the claims in a preview of a documentary set to air on state television on Wednesday.

The documentary claims that “agents from special forces from Chechnya were embedded” in ISIS training camps to collect intelligence and help identify targets for Russian air strikes.

Quoting Kadyrov, it said that the “best fighters” from mostly Muslim Chechnya have managed to create an “intricate agent network directly inside IS,” although some have been killed.