The Estonian Internal Security Service (KAPO) says in hindsight that it was not necessary to catch the man red-handed. Evidence collected in cooperation with the public prosecutor's office was sufficient.
The latter reveals Zinchenko as a collaborator of Russian military intelligence GRU whose main task was to collect information on national defense objects and those ensuring vital services in Estonia. Zinchenko mainly operated in Tallinn but also visited other areas to collect information, take pictures, and collect items when ordered to by his handler.
Zinchenko did not always have to skulk around objects or take pictures from behind a fence – often he would simply visit Defense Forces events or visitors' days.
The GRU was equally interested in military constructions and troop movements and objects meant to ensure vital services: various junctions and communications centers. The aim was to determine the type of technology used, access routes, defense measures, and weak points.
„He would map operative environments that interested the GRU – where and how things were done,“ KAPO press representative Harrys Puusepp said.
Information Zinchenko collected was not protected by state secrets. He made no attempt to recruit accomplices, for example among Defense Forces members.
Zinchenko periodically forwarded information to GRU operatives both using communication channels and when visiting Saint Petersburg. He was controlled by several handlers the identities of whom have become apparent to KAPO. Zinchenko did not ask for payment for his efforts but acted in Russia's interests following different considerations.