just found the soviet/russian nickname for the mig 21 its "balalaika" which is a triangular shaped musical instrument (as is a delta wing..shaped that is!!)

Silver Balalaikas??
Silver Mongols??

Other funny stuff..the mig 25 apparently had the nickname Letaushchii gastronom meaning flying liqor store..after the amounts of booze that are injected into the engines to boost power