Strategy Page on the odd post-sales attitude of Russian aviation manufacturers:
Indonesia knows that India has learned how to deal with shabby Russian support. For example, earlier this year India went public with yet another complaint about the Su-30 fighters it buys from Russia. This time it was an unspecified “design flaw” in the electronic flight control system. This bit of information was made public because India has found that more discreet communications about these matters results in little or no action from the Russians. For example, India has been pressuring Russia for several years to do something about component failures in the Russian designed AL-31 engines that power the Indian Su-30MKI jet fighters. There have been several AL-31 failures because of this in both Indian and Russian Su-30s.
[. . .]
India buys bare bones fighters from Russia and equips these Su-30MKIs with Israeli sensors and communications gear. In many respects, the Indian made Su-30s, the Su-30MKI, is the most capable version available, due to its Israeli and European electronics and the well trained Indian pilots. The 38 ton SU-30MKI is most similar to the two seat American F-15E fighter-bomber. Even though equipped with Western electronics, the aircraft cost less than $40 million each, about half what an equivalent F-15 costs. The Su-30MKI can carry more than eight tons of bombs and hit targets over 1,500 kilometers away.
Indonesia has already become disenchanted with its Su-30s and announced last August the six Su-30 jet fighters it ordered from Russia earlier this year (for $78 million each) would be the last Russian fighters purchased. Indonesia already has ten Su-27s and Su-30s, and wanted at least 16 of these modern aircraft so they will have a full squadron.