Other Nations
In my time on QRA I had a slack handful of Russians, a Syrian, 2 Libyans, an Israeli, an Italian and several Americans.
None were bent on attacking UK and/or her interests but all were in airspace for which the UK was responsible (DfT as well as MOD) and 'patrolled' by UK aircraft. They were not complying with the normal standards of reporting and use of airspace including the necessary diplomatic clearances. So we went to have a look; as they could have been anybody - simple really.
Hardest of all was the low level relatively slow thing just under a 1500' cloud base by night in the Iceland Faeroes Gap. Only light on the beast was an anti-col down the back somewhere and the only thing we could see was a MAD boom. Never really sure if it was a P3 or a Nimrod as neither community would admit to be out there at the time (some clandestine op I suspect kept secret even from our own side!).
Happy days.
ps I've black-listed the Times on-line too!!