Disputed islands: China's air defence zone move angers Japan
A war of words has broken out between China and Japan over disputed islands, known as the Senkaku islands in Japan and the Diaoyu islands in China.
Japan's Prime Minister Shinzo Abe has described China's move to create a new "air defence identification zone" over the territory as "dangerous".
China has voiced anger at Japanese and US objections to the new air zone, and lodged complaints with their embassies.
The BBC's Rupert Wingfield-Hayes in Tokyo and Martin Patience in Beijing assess how the dispute is viewed in their respective countries.
- BBC News