Chinese J-11 fighter intercepts US surveillance aircraft in an "unsafe" manner.
The same day, Chinese Navy simulated an attack on a US task group in the South China Sea.
The exercise involves Shandong aircraft carriers and other planes.
US RC-135 could have been monitoring the Chinese military drill.
US Navy carrier strike groups have conducted exercises in the region.
China claims sovereignty over most of the South China Sea, building militarized islands.
Bashi Channel sees significant air and naval activity, including US patrols.
Increasing tensions and military activity in the region.