On the occasions that I flew to Tehran when based at RAF Sharjah we were always very conscious of the proximity of the USSR Border.
Yeah right Caz.....what kind of navigator are you?
You would have had to cross a whole mountain range to get to the Russian border....and ignore a rather large bit of water called the Caspian Sea in the process!
One would have to be almost two hundred nautical off course and beyond your destination to cross into Russian airspace!