CNN was aboard the P8-A Poseidon, America’s most advanced surveillance and submarine-hunting aircraft, and quickly learned that the Chinese are themselves displeased by the U.S. pushback.

“This is the Chinese navy … This is the Chinese navy … Please go away … to avoid misunderstanding,” a voice in English crackled through the radio of the aircraft in which CNN was present…

The aircraft flew at 15,000 feet in the air at its lowest point, but the U.S. is considering flying such surveillance missions even closer over the islands, as well as sailing U.S. warships within miles of them, as part of the new, more robust U.S. military posture in the area…

Wednesday’s mission was specifically aimed at monitoring Chinese activities on three islands that months ago were reefs barely peaking above the waves. Now they are massive construction projects that the U.S. fears will soon be fully functioning military installations.