Kremlin-installed official of Russia-held Donetsk,Yan Gagin, has alleged Ukrainian link to Moscow attack. Yan Gagin claimed that the Crocus city hall attackers were 'well-trained mercenaries'. He believes Ukrainian special services "orchestrated" the terrorist attack on Moscow hall. Yan Gagin's claims were reported by Russia’s state-owned news agency, RIA Novosti. Ukraine time and again rejected Russian charge of its involvement into Moscow attack. Watch this to know more. INTERNATIONAL NEWS