I'm amazed at the amateur nature of the guy on that call. If he's GRU/FSB trained, why would he trust a caller ID from base, and nothing else? Surely there's better opsec than this.
See for example here, where a bunch of FSB agent graduates decided to celebrate in the open: https://edition.cnn.com/2016/07/11/world/geliki-russia-fsb-j...