Delyatytskyi was born in Khabarovsk to a Soviet military family and lived in the Russian Far East and in the north of Russia before moving to Ukraine.

After Ukrainian independence he joined the country's military[1] and graduated from the Odesa Institute of the Ground Forces.

When the Russian Federation annexed Crimea, Delyatytskyi led about two companies of marines that kept their oath of loyalty to Ukraine back to the Ukrainian mainland, where they were based in Mykolaiv.

The unit consisted of the Ukrainian marines that had left Crimea, former members of the original Coastal Defense Brigade, and volunteers that joined after it was formed.

[4] In the spring of 2018, when the Ukrainian Navy established a new Marine Corps Command and began reforming the Ukrainian Naval Infantry along the lines of the United States Marine Corps, Delyatytskyi became its deputy commander.