China first aircraft carrier has successfully completed sea trials in the South China Sea the liaoning returned to port last Wednesday after 37day voyage the official xinhua new agency said it said the carrier tested its combat system and conducted a formation practice all tests and training programes went well as scheduled it said early in the trial run one of the ships accompanying the carrier was involved in a near collision with a us navy ship which a Chinese media report blamed on the us ship getting too close to the liaoning it mark the two countries most serious sea confrontation in year