
Rosoboronexport recently offered upgrade of 80 of India’s Su-30MKIs with the advanced AL-41F-1S engine. New Delhi has declined this upgrade, preferring AL-31FP.
Source

Rosoboronexport recently offered upgrade of 80 of India’s Su-30MKIs with the advanced AL-41F-1S engine. New Delhi has declined this upgrade, preferring AL-31FP.
Source