the 4 hind was the minor sale we should develop good trust with Russia then we thinks for big ticket items from Russia, in few year back there were a news here on PDF about we ask to buy Su-35 from Russia but Russia politely decline and it will be expensive to buy form Russia and upgraded from China, let suppose we will buy used 40-50 Su-30 from third country it will cost 40-50 million $$$ per jet and to install AESA/IRST/EW/ECM/ESM or may be engine it would cost more then 60-70 million $$ per jet, isn't this wise to buy J-10C directly from China for a price of 65 million $$$???