Tensions between China and Japan, Asia's two biggest economies, are seen as one of the biggest risks facing the world. Here's a timeline of recent developments highlighting geopolitical tensions in Asia.
November 23: China declares "Air Defense Identification Zone" in East China Sea covering territory claimed by China, Japan, Taiwan and South Korea. Move criticized by Tokyo, Seoul and Washington.
November 29: China says it scrambled fighter jets to monitor U.S. and Japanese planes as they flew in the new air defense zone.
December 5: The White House says China's new air defense zone is "unacceptable" and urges Beijing not to implement it.
December 7: China's parliament says Japan has no right to criticize air defense zone.
(Read more: China-Japan tensions: Who has the smartest approach?)
December 8: South Korea extends its air defense zone to partially overlap China's.
December 13: U.S. navy issues statement saying a U.S.guided missile cruiser operating in international waters in the South China Sea a week earlier was forced to take evasive action to avoid colliding with a Chinese navy ship. The incident is later confirmed by Chinese authorities.
December 14: Japan's Prime Minister Shinzo Abe says China's air defense zone is "unjustly violating the freedom of aviation over the high seas."
December 26: Abe visits the Yasukuni war shrine in Tokyo that honors Japan's war dead, including some convicted war criminals. China calls the visit "absolutely unacceptable to the Chinese people" and Seoul expresses its "regret and anger." U.S. embassy in Tokyo says it is "disappointed."