Answer : 1. "Sri Lanka"
Explanation :

Solution: Recently the ninth edition of the joint military exercise “Mitra Shakti-2023” between India and Sri Lanka has started in Pune. The Indian contingent consists of 120 personnel, mainly soldiers of the Maratha Light Infantry Regiment. From the Sri Lankan side, personnel from 53 Infantry Division are participating. Additionally, 15 personnel from the Indian Air Force and five from the Sri Lankan Air Force are also participating in the exercise.