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

At least four people died overnight as Russian drone and missile strikes continued to pound Ukraine’s towns and cities, local officials said Saturday. Meanwhile, Moscow’s troops continued their grinding advance through the country’s east.

Armen Sarkisyan has been described as a "crime boss" by Ukraine's SBU intelligence service. It said he was suspected of participating in and aiding "illegal armed groups" and had formed a pro-Russian military unit made up of local convict fighters.