Chinese guided-missile destroyer Yinchuan (Hull 175, L) and guided-missile frigate Yuncheng (Hull 571, R) dock at the Karachi military port after completing the drills at 6 p.m. on January 13, local time. (eng.chinamil.com.cn/Photo by Dong Zhaohui)

The Chinese and Pakistani naval ships steam in formation in waters of the northern Arabian Sea.(eng.chinamil.com.cn/Photo by Mu Ruilin)

The Pakistani ship (Hull 1013) and the Chinese guided-missile destroyer Yinchuan (Hull 175) steam alongside with each other during the drill on January 10, local time. (eng.chinamil.com.cn/Photo by Dong Zhaohui)

The Pakistani naval observer communicates with the interpretor of the Chinese Navy aboard the guided-missile frigate Yuncheng (Hull 571) on January 10, local time. (eng.chinamil.com.cn/Photo by Dong Zhaohui)

The national flags of China and Pakistan fly at the Karachi military port in Pakistan on January 13, local time. (eng.chinamil.com.cn/Photo by Mu Ruilin)

Sailors of the guided-missile frigate Yuncheng (Hull 571) drop a floating target over board during the maritime phase of the Sea Guardians 2020 in waters of the northern Arabian Sea on January 10, local time.(eng.chinamil.com.cn/Photo by Mu Ruilin)

A Chinese ship-borne helicopter prepares to land on the Pakistani naval ship. (eng.chinamil.com.cn/Photo by Mu Ruilin)

Chinese and Pakistani sailors participating in the PN-PLAN Bilateral Exercise, code-named Sea Guardians-2020, man the rails as the ship steam to the port after completing the joint drill on January 13, local time. (eng.chinamil.com.cn/Photo by Mu Ruilin)