The leaders of China, Japan and South Korea are holding a trilateral summit in China this week amid feuds over trade, military maneuverings and historical animosities. Most striking has been a complex dispute between Seoul and Tokyo, while Beijing has recently sought to tone down its disagreements with its two neighbors.
 
 
Economic cooperation and the North Korean nuclear threat are the main issues binding the Northeast Asian troika. While no major breakthroughs are expected at the meetings, the opportunity for face-to-face discussions between the sometimes-mutual antagonists is alone considered significant. Below is a look at the current state of relations among the three.

Japan-South Korea
  1. Tensions rooted in South Korean resentment over Japan’s 20th century colonial occupation spiked this year to a level unseen in decades as they traded blows over wartime history, trade and military-to-military cooperation.
  2. The countries managed to strike a fragile truce in November after intervention by the United States, which was concerned about the growing rift between its two key Asian allies. 
  3. Seoul then walked back a declaration to terminate a bilateral military intelligence-sharing agreement with Tokyo, an important symbol of their three-way security cooperation driven by the nuclear threat from North Korea and China’s growing regional clout.
  4. Tokyo, in turn, agreed to resume discussions with Seoul on their dispute over Japan’s tightened controls on exports of key chemicals used by major South Korean companies to make computer chips and smartphone displays. 
  5. Japan’s controls were widely seen as retaliation for South Korean court rulings that called for Japanese companies to offer reparations to aging South Korean plaintiffs for their World War II forced labor. Last Friday, Japan announced that it will ease export restrictions on one of the chemicals.
  6. South Korean President Moon Jae-in and Japanese Prime Minister Shinzo Abe will hold a one-on-one meeting on Christmas Eve on the sidelines of the trilateral summit.
China-South Korea
  1. South Korea’s relations with China, its biggest trading partner, have been strained over Seoul’s decision to host a U.S. anti-missile system that Beijing perceives as a security threat.
  2. China says the real purpose of the Terminal High Altitude Area Defense, or THAAD, system placed in southern South Korea is to peer deep into its territory, rather than to warn of North Korean missile launches.
  3. China retaliated by restricting Chinese tour group visits to South Korea, boycotting South Korean television shows and other cultural products, and wrecking the Chinese business operations of major South Korean retailer Lotte, which provided the land for the missile system.
  4. While Beijing’s fury appears to have subsided, there’s also uneasiness in Seoul over increasing Chinese and Russia air patrols over waters between South Korea and Japan. 
Japan-China
  1. China’s relations with Japan had been more acrimonious than with any other foreign state, but have in recent years undergone a remarkable transformation, partly as a result of the U.S.-China tariff war.
  2. Planning is underway for a state visit by Mr. Xi to Japan in the spring, made possible by the temporary shelving of contentious political issues and Beijing’s desire to exploit regional dissatisfaction with Washington over its trade policies.
  3. Japan also considers China’s growing maritime activity in regional seas and the upgrading of its military as a threat along with North Korea’s missile and nuclear programs. 
  4. Tokyo has responded by upgrading its own defense capabilities and working with Chinese rival India, as well as with Southeast Asian countries and Australia.
 
 
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