The following is based on a translation of a report on a Chinese news website:
The waters to the southwest of China’s Hainan Island are close to Vietnam where there was a serious standoff between China and Vietnam when a Chinese oil rig operated there last year.
Mil.huanqiu.com says in the report that publishes the photos that China conducted its first air-sea three dimensional patrol on September 25 with the goal “to ensure navigation safety and protect the ocean environment.”
The total mileage of the patrol is 300 nautical miles covering the usual shipping routes and the areas around Chinese drill platforms Yacheng 13-1 and Dongfang 1-1.
The shipping route is near Vietnam and the distance between Hainan and Vietnam is only 140 nautical miles; therefore the 300 nautical mile patrol covers most of the disputed waters between China and Vietnam.
Source: mil.huanqiu.com “Aerial photos of drill platforms in the sea area to the southwest of Hainan Island” (summary by Chan Kai Yee based on the report in Chinese)
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