The Kremlin has confirmed for the first time that Vadim Krasikov, who was released from a German jail as part of a historic prisoner swap on Thursday, was an agent of the Russian domestic Federal Security Service (FSB). Vadim Krasikov had worked in the FSB’s “Alpha” unit, which specializes in anti-terror operations, the Kremlin said on Friday. “When he served in Alpha, he worked with some employees of the Presidential Security Service,” Kremlin spokesman Dmitry Peskov told Russian news agencies. “Of course they greeted each other yesterday when they saw each other,” he said, referring to Krasi…