BEIJING, Dec.21 -- Pakistani Chief of Army Staff General Qamar Javed Bajwa visited an air base on December 18, 2020, where the Chinese and Pakistani air forces were conducting the “Shaheen-IX” joint air exercise.Gen. Qamar said that the joint training exercise is vital for both sides amid emerging geo-strategic challenges. Since 2011, series of such joint training exercises have been held between China and Pakistan on alternate basis.