A Chinese-produced J-10 fighter jet is displayed outside the offices of the Aviation Industry Corp. of China in Beijing. China's newly established air defense identification zone has caused much consternation in the region. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images

Two U.S. B-52s, like the one shown here, have flown through an area that China says is within its air defense zone. China's announcement has irked its neighbors and the U.S. and Japan say they won't abide by it. Andy Rain /EPA/Landov hide caption

itoggle caption Andy Rain /EPA/Landov