WEBF,
Were they pretending to be MiGs? Can you think of any non landlocked nations who don't get on too well with the UK/West and operate Russian and Chinese aircraft?
Err, yes, just a few!! How about Iran, Syria, North Korea, China, Yemen, Cuba, Indonesia, Algeria, Eritrea, Ethiopia, Zimbabwe (the last 2 admittedly landlocked), Serbia/Montenegro and Peru to name a few!!!!
However, red air doesn't necessarily mean they were simulating Russian or Chinese types.
Regards,
MM