The Hai Yang Shi You 981 standoff, also known as the 2014 China-Vietnam oil rig crisis, refers to the tensions between China and Vietnam arising from the Chinese state-owned China National Offshore Oil Corporation moving its Hai Yang Shi You 981 oil platform to waters near the disputed Paracel Islands in South China Sea, and the resulting Vietnamese efforts to prevent the platform from establishing a fixed position. According to an announcement by the Hainan Maritime Safety Administration of China, the drilling work of the Hai Yang Shi You 981 would last from May 2 to August 15, 2014. On July 15, China announced that the platform had completed its work and withdrew it fully one month earlier than originally announced.

The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by South China, in the west by the Indochinese Peninsula, in the east by the islands of Taiwan and northwestern Philippines, and in the south by the Indonesian islands of Borneo, eastern Sumatra and the Bangka Belitung Islands, encompassing an area of around 3,500,000 km2 (1,400,000 sq mi). It communicates with the East China Sea via the Taiwan Strait, the Philippine Sea via the Luzon Strait, the Sulu Sea via the straits around Palawan, and the Java Sea via the Karimata and Bangka Straits. The Gulf of Thailand and the Gulf of Tonkin are part of the South China Sea.