Su-30MKK belonging to China airforce testing and training centre.
Increased external harpoints from Su-27SK/UBK's 10 to 12. The new hardpoints were situated at the wing roots, and can carry 2000Kg large air to ground missile, Increase total munition weight carried from 6 tonnes to 8 tonnes.
Internal fuel tank can carry 19185Kg fuel, containst retractable refuel probe. The landing gears and internal structure were reinforced due to increased take-off weight.
Large aspect ratio composite vertical tails. The tails contain internal fuel tanks to further increase range.