from gaum into a disputed area claimed by beijing and tokyo. the chinese government announced the expanded zone saturday and said it monitored the air-croft. the latest reaction from japan, starting with the u.s. ambassador. >> unilateral actions taken by china with the announcement by an east china air defense undermines security and an attempt to change the status quo in the east china sea. it only serves to increase tensions. japan showed greater restraint. we urge them to continue to do so. >> translation: the publication of china's air defense identification zone was unilateral. the backlash from the international community, including south china and taiwan - we'd like to see it retracted. we cannot accept it. i believe the u.s. is working from the same standpoint. >> let's get a closer look at the territory we are talking about. you can see china, taiwan and japan. here is the line indicating china's territorial waters. china announced an air space defense zone on saturday. you can see the zone is close to japan and takes in what the chinese call the senkakku islands, what china called the diaoyu island. both countries claim to own the islands. this was the offici