KYIV – A day after an Odesa-born medic and sniper of Chechen heritage who fought in the Donbas war was fatally shot, the Security Service of Ukraine detained the alleged Kremlin-guided assassin of one of their own high-ranking officials.

It was the latest reminder for this war-weary country of 42.5 million people that the conventional battle in the easternmost regions of the Donbas is being waged also nationwide asymmetrically through alleged Moscow-controlled cells of agents, provocateurs and trained assassins.