Ukraine plans to seek the extradition of Bulgarian national Georgi Bliznakov from Bulgaria over suspected participation in a battalion of pro-Russian rebels fighting government forces in Donbas region, Sofia-based bTV broadcaster reported on Monday.

Bliznakov came under the spotlight in Bulgaria as one of several thugs who beat a car driver in a brawl on Sofia Ring Road last week. Four men, including Bliznakov, have been arrested for the incident. Bulgarian print and TV media have released a video showing the beating said to have been made by the victim’s wife. 

Ukraine will request Bliznakov’s extradition on the grounds of alleged “illegal crossing of Ukraine’s border, participation in illegal armed formations and taking part in a war against  Ukraine,” bTV quoted Anton Gerashchenko, an aide to the country’s minister of the interior, as saying.

“If he [Bliznakov] is found to have participated directly in killing and torturing our citizens, he could be sent to jail,” Gerashchenko has said, according to bTV.

Bulgaria has received no extradition request yet, bTV added.