A prominent Chechen militia leader implicated in a failed plot to assassinate Russian President Vladimir in 2012 was ambushed by unknown assailants in Ukraine who reportedly sprayed automatic weapons fire into his vehicle, wounding him and killing his wife.

Adam Osmayev, who has commanded a Chechen battalion fighting alongside Ukrainian forces against pro-Russian separatists since 2015, was reportedly wounded in the leg during the attack. He has long been an enemy of the Russian government, and has now survived two assassination attempts in this year alone, although no one has claimed responsibility for the attack. Amina Okuyeva, Osmayev’s wife and an accomplished partisan fighter, thwarted the last attempt in June when she drew her own weapon and shot the would-be assassin.

Okuyeva’s killing highlights the ongoing violence between a number of armed groups associated with the conflict in Ukraine, where the fighting in the country’s east continues, albeit on a smaller scale than some of the peak clashes in previous years. This ambush comes shortly after another killing in Kiev last Thursday, which targeted Ukrainian member of parliament Ihor Mosiychuk. A bomb detonated as Mosiychuk was exiting a building, killing one of his bodyguards and another person but leaving him only injured.

Osmayev and Okuyeva are a famous couple in Ukraine, who are hailed locally as heroes for volunteering to fight against the pro-Russian elements which remain entrenched in the Donbass. Amina was Ukrainian by birth, having grown up in Odessa. The war in Ukraine has drawn hundreds of foreign volunteers, who fall in under units overseen by the Ukrainian Ministry of Defense.