Moderator: in July 11th the Chinese people's Liberation Army conducted live-fire exercises in the East China Sea is located in the North West , exercises the Diaoyu islands . Explanation: according to the Ningbo Maritime Bureau issued a notice to Mariners No. 9 , area of the East China Sea and the actual use of weapons training specific time has been determined , for hours of July 11, 2013 to 18, in the following waters within firing exercise . The actual use of weapons training period, to prohibit any ships into the waters , and subject to site alert ship command . From the map view , the area is located in the northwest of the Diaoyu islands . According to the previous record of the East China Sea exercises , this exercise is very likely the airsea battle , including coral reefs , mastery of the air and sea battle .