MiG-21E is an heavier version of MiG-21bis
in mid 1970s, Soviet Union decided to make a newer and better version of MiG-21bis
Then the MiG-21E prototype made its first flight in 1965
In 1970, the MiG-21E started to serve in Soviet Air Force
with its incredible payload it was very superior in air-to-air combat
MiG-21E took a huge place in Cold war and never been exported this aircraft
in 1996, MiG-21Es was retired and replaced by SU-30s
here is some images of MiG-21E
here is the cockpit
an MiG-21E firing its all cannons
sry for my broken english, im not fully american