The briefing on countering Russian special services will be held on May 21 at 11.00 at the press center of the Security Service of Ukraine. Additional evidence of presence of Main Intelligence Directorate (GRU) of the General Staff of the Armed Forces of Russian Federation in Ukraine in 2014-2015 will be presented by Ukrainian counterintelligence officers. Accreditation will last until 10.00 on May 21 by telephones: (044) 255-51-86, (044) 255-55-74.