After graduation of the school education, he graduated the college of industrial automation in Lviv and made a compulsory service in the Soviet Army.

Koltun was ordained as priest on 13 December 1981, after completing clandestine theological studies.

[1] From 1990 until 1993 he openly served as priest, missionary and founder of the new Greek-Catholic parishes.

His consecration was the first open one in time, when the "Catacomb Church" became free, after Dissolution of the Soviet Union.

The principal consecrator was Cardinal Myroslav Ivan Lubachivsky, the Head of the Ukrainian Greek Catholic Church.