Australian navy's guided missile frigate HMAS Melbourne arrives in the port city of Qingdao, East China's Shandong province, April 21, 2019, to join multinational naval events commemorating the 70th anniversary of the founding of the Chinese People's Liberation Army (PLA) Navy. The events will be held between April 22 and 25 and a naval parade will be held in Qingdao and nearby sea areas and airspace on April 23.(Photo/Xinhua)

Russian navy's guided missile frigate Admiral Gorshkov arrives in the port city of Qingdao, East China's Shandong province, April 21, 2019, to join multinational naval events commemorating the 70th anniversary of the founding of the Chinese People's Liberation Army (PLA) Navy. (Photo/Xinhua)

Indian navy's destroyer INS Kolkata arrives in the port city of Qingdao, East China's Shandong province, April 21, 2019, to join multinational naval events commemorating the 70th anniversary of the founding of the Chinese People's Liberation Army (PLA) Navy. (Photo/Xinhua)

Brunei's warship KDB Daruttaqwa arrives in the port city of Qingdao, East China's Shandong province, April 21, 2019, to join multinational naval events commemorating the 70th anniversary of the founding of the Chinese People's Liberation Army (PLA) Navy. (Photo/Xinhua)

Republic of Korea frigate Gyeonggi arrives at Qingdao, East China's Shandong province, on Sunday to mark the PLA Navy's 70th anniversary. (Photo/Xinhua)

An Indian Navy frigate arrives at the port in Qingdao for the upcoming joint sea parade, in East China's Shandong province, April 21, 2019. (Photo by Xu Jingxing/chinadaily.com.cn)