Armen Sarkisyan, the founder of a separatist battalion fighting in eastern Ukraine, died after an explosion in an apartment complex, according to reports citing the Russian authorities.

Armen Sargsyan, the leader of a paramilitary unit wanted by Ukraine, died from his injuries following an explosion on Monday morning.

A pro-Putin paramilitary leader was killed in a bomb blast in the lobby of a luxury apartment building in Moscow, according to Russian authorities and news reports.