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The Ukrainian Security Service has released a CCTV video detailing how an employee of the agency in Donetsk let Russian-backed insurgents into the Donetsk Airport in May. A serviceman using his magnetic card provided a smooth entry to the administrative building of the airport. Heavily armed Russian-led insurgents stormed the building on May 26. The next day, Ukrainian soldiers regained control. The revelations show further evidence that members of Ukraine's security service early on in the battle for Donbas were infiltrated by pro-Russian forces.