Boy,Go to school , learn history and come back!!!This is not a place for your nonsense talks.
Foget your F-6 gibberish talks.You even do not know what's MIG-21 to talk abt here.
Mig 21 loss was two to J-6 Four in 1971 war. J-6 was just a Mig-19 Chinese variant.You learn that first.
Mirage 2000 have been used in Youglosovia,Kargil war and now in Afghanistan.Get facts right.
SU-30 was introduced only in 1996 and too early to put to a comabt situation but SU-27 planes have been used..One example is Ethopia -Eritrian war of 1999......
Besides, Russia the then U.S.S.R had used Sukhois in Afghanistan.