• Reuters


China is signaling it is prepared to stand its ground on two key regional fronts, diplomatically confronting the United States and South Korea over new missile defenses and intensifying pressure on Japan at sea over disputed islets.

Mainland analysts see little immediate chance for an easing of the tensions roiling Northeast Asia, saying a rising China is showing it is keen to shape its own battlefield despite fresh threats.

“This action is China saying to the world that it has the ability to fight two regional conflicts on its doorstep,” said Ni Lexiong, a naval expert at the Shanghai University of Political Science and Law: the South and East China seas.

Beijing’s claims to much of the South China Sea were invalidated last month in an emphatic ruling by an arbitration court in The Hague in a case brought by the Philippines, a rival claimant.

The region’s deepening fault lines after the ruling were exposed last weekend as a fleet of Chinese coast guard and fishing vessels sailed near Japanese-controlled islets in the East China Sea. Japan warned China on Tuesday that ties were “deteriorating markedly.”

Tokyo worries that Chinese control of the South China Sea, through which much of the oil it imports is shipped, threatens its national security and takes Beijing a step closer to extending its influence into the western Pacific.

Japan has cranked up assistance recently to two countries that have territorial disputes with China in the South China Sea: the Philippines and Vietnam.

Japan’s administration of the disputed islands it calls the Senkakus puts them under the security treaty between Washington and Tokyo.

Kevin Maher, a Washington security consultant and a former head of the State Department’s Office of Japan Affairs, said he thinks China is trying to warn Japan not to interfere in the South China Sea after Tokyo strongly endorsed the Hague ruling.

China “wants to see how far they can push until they get pushed back,” Maher said. “Their ultimate goal is hegemony in the South China Sea and the East China Sea.”

At the same time, South Korea’s presidential Blue House rebuked China for criticizing Seoul’s decision to deploy an advanced U.S. anti-missile defense system, urging Beijing to instead work harder to rein in North Korean nuclear and missile tests.

While China has grown increasingly irritated over North Korea’s nuclear and missile tests, it vehemently opposes South Korea’s decision to host a Terminal High Altitude Area Defence (THAAD) unit with the U.S. military.

Beijing sees THAAD’s radar system, capable of peering into China’s military installations, as part of Washington’s strategy of containment, with the two powers clashing over China’s possible militarization of rocks and reefs in the disputed South China Sea.

Recent satellite photographs show China appears to have built aircraft hangars that could accommodate any fighter jet in its air force on artificial islands it is building on reefs in the South China Sea, according to the Center for Strategic and International Studies (CSIS), a Washington think tank.

THAAD’s location was announced a day after The Hague court ruled against China’s claims in sea, through which some $5 trillion of cargo passes annually. South Korea and the United States have said THAAD would only be used in defense against North Korean ballistic missiles.

Washington’s alliances with Japan and South Korea are crucial to its strategic “pivot” to Asia, but the three countries have been coordinating with China over the years in a flagging effort to curtail North Korea’s nuclear ambitions.

In recent months North Korea has conducted its fourth nuclear test and launched a series of missiles — the latest on Aug. 3, when one ballistic missile flew about 1,000 km (600 miles) and landed in Japanese-controlled waters.

The economic stakes in the region are high as well. Japan, South Korea and China account for a quarter of the world’s economy, and tensions among them risk having a chilling effect on trade and investment at a time of slower growth.

Yet the strong economic ties and the stumbling diplomacy could help defuse potential clashes.

“China has its own limits to where it can go,” said Lee Tai-hwan, the director of the China studies center at the Sejong Institute near Seoul. “It can’t simply stop complying with U.N. sanctions against North Korea. They don’t want to leave a bad example in relations with neighboring countries by doing something bad to South Korea.”

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