Chinese and Malaysian naval vessels take part in a joint escort exercise during their first joint military drill, coded "Peace and Friendship 2015", in the Malacca Strait, Sept. 19, 2015. (Xinhua/Liu Wei)

Chinese commandos land on a "trade ship" from a helicopter as they take part in a joint escort exercise during Chinese and Malaysian first joint military drill, coded "Peace and Friendship 2015", in the Malacca Strait, Sept. 19, 2015. (Xinhua/Jiang Long)

Chinese and Malaysian commanders work together in a joint escort exercise during their first joint military drill, coded "Peace and Friendship 2015", aboard Chinese missile destroyer Lanzhou in the Malacca Strait, Sept. 19, 2015. (Xinhua/Wang Yushan)