Answer : 1. "India"
Explanation :

India has decided to purchase 12 Sukhoi SU-30 MKI fighter aircraft.

1. Reason behind the purchase: To enhance and modernize the strength of the Indian Air Force.

2. Manufacture of aircraft: In India by Hindustan Aeronautics Limited (HAL).

3. Price: ₹11,000 crore.

4. Use of aircraft: In both air-to-air and air-to-ground attacks.

5. Impact: To enhance India's defence capabilities and strengthen it as a regional power.