ML / MLA
There were only about 200 ML aircraft .. still with old gunsight and R-23 missiles.
Then came the MLA .. (1100+ aircraft .. cant recall exact #) with better radar, new gunsight and R-24 missiles. And it was this MLA of which export variants were sold to all the many export customers .. Cuba/Angola, Iraq, Syria, NK, East Germany, Czechoslovakia and others.
The Russians seem to have never changed public info to "MLA", they continued to use the "ML" designation .. and thats why the many exported aircraft are usually referred to as "ML" when they really are a improved MLA variant.
Iraq received one of the last produced MLA batches in '84.
The further improved MLD were all (and only) modifications from RuAF MLA's. None of the original ML's were modified.