Sir Please Check on Google the structural defects on Mig 29. Su 30 mki has crashed due to spare part unavailability. Su 30 and rest flankers were grounded in Russia and Central Asians countires from time to time.
F 16 bohat aala Aircraft hai and so is Jf 17.
but whenever get a chance replace the engine as Russians are worse in service. Our Defence Minister recently had a meeting with IAF and HAL for solving the low availability of Spare parts for Su 30 MKI. Su 30 MKI crucial part is the engine and when that is not right. As encountered by our best aircrafts , the thrust vectoring engine has a tendency to stall mid air, which has led to engine crashes. We too now need aircrafts that are faster to respond, Easy to maintain, carry loads of weapons and that can compliment Su 30 mki in missions. Hopefully HAL tejas will solve the issue of spare parts as 60% made in india except the Engine , and radar. Russians engine tend to stall mid air, Black smoke and top speed can only be achieved during after burn which greatly reduces engine life compared to Sncema , GE.