India has reportedly paid approximately $218 million to buy a batch of R-27 air-to-air missiles. The missiles will be equipped on the SU-30MKI aircraft of the Indian Air Force. The missiles have been acquired under 10-I (ten days at intense rate of expenditure) projects, which mandate the three services to maintain critical weapon systems and spares for a specified minimum period. The R-27 is a medium-to-long-range air-to-air missile developed by Russia for its MiG and Sukhoi series of fighter jets. Russia developed these missiles to add capability to the Sukhoi and MiG warfare aircraft. The Indian Air Force has signed $1.1 billion deals in the past two months. These deals were supposed to acquire equipment under emergency requirements.