Since China announced the nine-dash line in the South China Sea, disputes over navigation rights, fishing rights and resource exploration rights have continued among countries in the South China Sea. The Philippines filed a complaint with the International Court of Justice in The Hague in the Netherlands in 2014. The International Court of Justice in The Hague ruled that China’s nine-dash line violated the United Nation Convention on the Law of Sea (UNCLOS) in 2016, but China declared this judgment invalid. And speed up the South China Sea-related military installations.
On the other hand, the influence of China’s telemarketing list One Belt One Road policy in the Red Sea and the Indian Ocean is increasing day by day. If the South China Sea is merged into its control, it will control the most important trade and energy channels in Europe and Asia. The US island chain strategy cannot block China’s European Asia Shipping Line. In order to curb China's expansion of power in the South China Sea, the United States has also launched a freedom of navigation operation, which has led to the continuous conflict between the two major hegemons in the South China Sea recently.
In recent years, the U.S.-China trade conflict has escalated to a national security level. In terms of diplomacy, US Secretary of State Mike Pompeo declared that former President Richard Nixon's policy of opening up to China has failed, and the US diplomatic principle towards China is "distrust and verify". And in the South China Sea launched a dual aircraft carrier military exercise. The Chinese People's Liberation Army also conducted countermeasures by conducting naval exercises in the South and flying over the central line of the Taiwan Strait.