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Russian police are looking for a gunman who shot a prominent Ukrainian separatist figure to death at a suburban Moscow restaurant.

Yevgeny Zhilin, 40, was shot Monday night in the Gorki-2 neighborhood west of Moscow. According to investigators, the killer, wearing a false moustache and sunglasses, had been waiting for the victim at a nearby table for 20 minutes and took several shots.

Zhilin died on the spot, while his companion was hospitalized in grave condition, Russia's Investigative Committee spokesperson told Tass news agency Tuesday.

Zhilin was an early organizer of the separatist movement in eastern Ukraine and took part in combat activities.

He was also the leader of the pro-Russian group Oplot, which had its own militarized forces. Zhilin has been on Ukraine's wanted list since 2015.