By the Pentagon’s account, two Chinese fighter jets performed an “unsafe” maneuver this week by flying within 50 feet of an American surveillance plane over the South China Sea. That’s not much more than a hairbreadth, aeronautically speaking, and a collision could have been catastrophic — to the crews and to the already fragile diplomatic relations between China and its regional neighbors and the United States.

China has been behaving in a bellicose fashion in the South China Sea for some time as part of a sustained and increasingly dangerous effort to assert sovereignty over a vital waterway in which other nations also have claims. In a few weeks, an international arbitration court is expected to rule in a case brought against China by the Philippines. The outcome could have a profound effect on the struggle for control of the sea, which is rich in resources and carries $5 trillion in annual trade.

Many experts expect the court to rule against China. The right response would be for China to accept the court’s decision and work with the Philippines and other neighboring countries that have interests in the region — Vietnam, Malaysia, Brunei and Taiwan — on a mutually acceptable resolution to their rival claims. But whether it will respond that way remains to be seen. So far, Beijing has refused to acknowledge the court’s jurisdiction, even though it ratified the treaty under which the case was brought — the 1982 United Nations Convention on the Law of the Sea, guaranteeing unimpeded passage on the high seas for trade, fishing and oil exploration.

China’s most aggressive and outrageous tactic has been to use tons of dirt and gravel and rocks to transform small reefs and rocks into artificial islands with airstrips and other military structures, including runways capable of handling military aircraft. According to the Pentagon’s annual report on China’s military, over the last two years China added more than 3,200 acres of land to the seven outposts in the Spratly Islands, while other countries that occupy disputed rocks and reefs in the archipelago added about 50 acres. China’s neighbors fear that Beijing intends to use these outposts to interfere with navigation and their rights to fish and drill for oil and gas.

http://www.nytimes.com/2016/05/21/opinion/playing-chicken-in-the-south-china-sea.html?_r=1