I can't help on the military radar situation over northeast Turkey circa 1966, but the possibility of nav error was high in those days and my recollection is that the airways were defined by relatively low-powered NDBs. That said, I recall a daytime flight from Teheran to Akrotiri circa 1967/8 when, once tuned to one of the beacons, the bearing shown looked distinctly dodgy and I found that there was music and speech on the frequency. Clearly a radio station was swamping it, and running a quick 3-line reverse fix showed the source to be just across the then-Soviet border, at Yerevan if memory serves.