The Sukhoi Su-35

The Sukhoi Su-35 (formerly Su-27M;Cyrillic: Сухой Су-35, NATO reporting name: Flanker-E) is a Russian heavy class, long-range, multi-role one-seat fighter. Developed from the original Su-27 air superiority fighter, it was originally designated Su-27M and later named Su-35. Due to the similar features and components it contains, the Su-35 is considered a close cousin of the Sukhoi Su-30MKI, a modernized Su-30 variant for India.
The original Su-35 has been further developed into the Su-35BM, classed as 4++ generation fighter by its manufacturer. It entered into serial production as the Su-35S. The Su-35 is in service in small numbers with the Russian Air Force. 

Variants

Su-27M/Su-35 

Single-seat fighter.

Su-35UB 

Two-seat fighter and trainer. Features taller vertical stabilizers and a forward fuselage similar to the Su-30.

Su-35BM 

Single-seat fighter with upgraded avionics and various modifications to the airframe. Su-35BM is informal name.

Su-35S 

Russian domestic version of Su-35BM.

Su-35K 

Export version of Su-35BM