Japan and China dispute which country owns several islands in the East China Sea. With its recent unilateral declaration of an air defense zone, China risks triggering an accidental conflict that could involve the US.
China and Japan have an ongoing dispute over the Senkakus islands, also know as the Diaoyu islands, an uninhabited island chain between Taiwan and mainland Japan. This weekend, Chinese took to the streets in protest after Chinese and Japanese activists both landed on the island in the past week.