Radical nationalist group Right Sector has seized an infantry fighting vehicle and a T-64 tank from separatists in the Donetsk region and is forming an armored unit as part of its military corps, Right Sector leader Dmytro Yarosh said in a Facebook post Monday.

The Right Sector set up the Ukrainian Volunteer Corps, headed by Andrei Stempitsky, in July but it has not yet been legalized as an official unit within the armed forces. The Patriot of Ukraine, a nationalist group affiliated with the Right Sector, also set up a military unit and formalized it as the Interior Ministry’s Azov battalion in May.