The older organisation, created in the spring of 1942, was a group of 300-500 soldiers commanded by Taras Bulba-Borovets, better known as the Ukrainian People's Revolutionary Army.
Efforts were made in March 1943 to unify the two groups, but were unsuccessful, owing to the Banderites launching an insurgency against German occupational forces.
"[4] Klyachkivsky, UPA-North's first commander, died in battle with Soviet troops on 12 February 1945,[5] and he was succeeded by Mykola Kozak [uk].
By the time Oliinyk had become commander, however, UPA-North had effectively ceased to exist as a result of Soviet counter-insurgency efforts.
[2] UPA-North continued to operate in a greatly-reduced form in southern Belarus until late 1953, when the group was completely crushed by Soviet troops.