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Relations between the world's two largest economies have become increasingly bitter in recent months, as US President Donald Trump continues to wage a trade war with the Chinese.
This week, the US Air Force flew B-52 bombers over the area of the South China Sea, which should prompt Chinese President Xi-Jinping.
In total, four B-52 fighter jets could be seen crossing the skies on Monday.
A second wave crossed the East China Sea on Tuesday.
Lt. Col. Dave Eastburn said on Wednesday that the bombers were participating in a "combined scheduled operation" that was part of "routine events designed to improve our preparedness and interoperability with our partners and allies in the region."
The military official added, "The US military will continue to fly, sail and operate where permitted by international law, at times and places of our choice."
Japanese fighter jets escorted the bombers on Tuesday as the military aircraft crossed the Diaoyu Islands, according to CNN.
Japan controls the desolate islands, but China has claimed them.
US Defense Secretary James Mattis on Wednesday raised warnings to reporters at the Pentagon.
Mr. Mattis stated that the flights were "not out of the ordinary".
He said, "It continues. If this had been done 20 years ago and China had not militarized these features there, it would have been that another bomber en route to Diego Garcia or elsewhere.
The United States uses Diego Garcia, the largest island in the Chagos Archipelago, as a military base in the region.
The Trump administration imposed heavy sanctions on the Chinese army for the purchase of Russian military equipment.
The White House is also engaged in a large-scale trade war with Beijing as Trump relentlessly pursues his "America First" mantra.
The trade has grown in recent days and the chances of a quick fix are unlikely.
The latest wave of Trump tariffs on about 200 billion dollars (153 billion pounds) of Chinese goods began Monday.
Beijing reacted in kind by imposing US $ 60 billion (US $ 46 billion) on US products.
