Since China declared an "Air Defence Identification Zone" (ADIZ) that covers the disputed islands called Senkaku in Japanese and Diaoyu in Chinese, the media have been full of predictions of confrontation and crisis. Japan immediately scrambled two F-15 fighters to intercept two Chinese aircraft that approached the islands.
"This announcement by the People's Republic of China will not in any way change how the United States conducts military operations in the region," said US Defence Secretary Chuck Hagel, and the US Air Force flew two B-52 bombers from Guam into the ADIZ.
A Pentagon spokesman said Washington "continued to follow our normal procedures, which include not filing flight plans, not radioing ahead and not registering our frequencies".
But forcing incoming aircraft to do just that is the whole point of creating an ADIZ. Aircraft entering the zone must provide a flight plan, maintain two-way radio communications and clearly identify their nationality, said the Chinese Defence Ministry, and aircraft that ignored the rules would be subject to "defensive emergency measures".
Prime Minister Shinzo Abe told Japan's parliament that the zone "can invite an unexpected occurrence and it is a very dangerous thing as well".