The terrorist was detained while attempting to cross theadministrative border between Crimea and mainland Ukraine, Censor.NET reports citing the pressservice of the agency.
Sosna is anactive partner of the creation of the Donetsk People'sRepublic.
He participated in the fighting on the side of theseparatists in the Donetsk region, conducted the overallcoordination of the terrorist informants, summarized theirintelligence findings and passed them to the leaders of Vostok(East) battalion for use in operations against the Ukrainianforces.
In addition, Sosna tried to organize export to Russia ofearly warning radar system Kolchuga (Chainmail)captured by the terrorists in Donetsk at TopazCompany.
In May-June 2014 he was directly responsible for sendingDonetsk separatists to Russian GRU (The Main IntelligenceDirectorate) combat training camps, the Ukraine Security Servicenotes.