China is reportedly suspicious of any us activity in the region, mainly because of the territorial dispute over the South China Sea.
Separately, China and South East Asian countries have agreed a framework for a long-awaited code of conduct for the disputed South China Sea, China's foreign ministry said, without giving details on the content.
According to the USA official, the two Chinese fighters came within 150 feet of the American plane.
She highlighted that the plane was on a routine mission at the time of the incident and was operating as per the worldwide law.
The U.S. aircraft, a WC-135 Constant Phoenix, is commonly referred to a "sniffer" because it detects signs of nuclear activity in the atmosphere by "sniffing".
In 2001 a Chinese jet collided with a US Navy surveillance aircraft off Hainan Island, killing the Chinese pilot and leading Washington to cut military relations with China after that episode.
Two Chinese fighter jets intercepted a U.S. Air Force aircraft flying over the East China Sea on Wednesday, according to reports.
The WC-135 crew characterized the intercept as unprofessional "due to the maneuvers by the Chinese pilot, as well as the speeds and proximity of both aircraft", Hodge said.
We will remind, earlier it became known that on may 14 North Korea has carried out another test launch of a ballistic missile a few days after the inauguration of the new President in South Korea. "Each interaction is different, and in this case, we are not providing more specifics as we would rather discuss it privately with China through our Military Maritime Consultative Agreement meeting and through diplomatic channels".
At the time, the United States military said its maritime reconnaissance aircraft was carrying out a routine patrol in the area.
In February, a US Navy spy plane and a Chinese military aircraft came within 1,000 feet of each other over the South China Sea.
"One of the intercepting Chinese jets had an unsafe excessive rate of closure on the RC-135 aircraft".