The Pentagon pulled China's invitation because of its "continued militarization" of the South China Sea.
Several H-6K bombers took off and landed from an air base from an unspecified location in the "southern sea area."
China said Friday its first home-built aircraft carrier has completed five days of sea trials.
Even without a final resolution, it is already clear which winners and losers are emerging.
The still-unnamed 50,000-ton carrier will probably be formally commissioned before 2020.
China denied allegations that its forces targeted U.S. aircraft with high-powered lasers near China's base in Djibouti.
The U.S. charged that China aimed laser beams at U.S. pilots in Djibouti.
U.S. service members will no longer be able to purchase ZTE and Huawei phones on bases, according to a DoD directive.
A pair of Air Force bombers flew over the South China Sea, just days after Beijing showcased its might in the region.
The Huawei phones could be used to gather sensitive information, according to U.S. intelligence agencies.