YELLOW SEA GUN FIRING FROM 1000UTC 20 MAR TO 0000 UTC 21 MAR IN AREA BOUNDED BY THE LINES JIONING: 36-30N/123-00E; 36-30N/124-00E; 37-15N/124-00E; 37-15N/123-00E,ENTERING PROHIBITED. SHANDONG MSA CHINA.