HariPrasad
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Its because of their huge landmass they need such big fighters . Secondly due to their massive petroleum production they dont need very efficient engines.
Russian engines are efeicient but naturally huge planes require huge engines and huge engines consumes more kerosene. Range of Russian fighters are very high and 3000 KM plus for almost all new aircrafts without refuel or tank.
SU 35 is a different and much more capable fighter from Su 27 family. It is light weight uses more powerful engine, uses a lots of composite in body and has low RCS.
It is aerodynamically much better than SU 30. It has totally different wing root.