China has called on the United States to refrain from “provocative” actions that might strain the relations between both nations. This statement came after two U.S. B-52 bombers flew near an island in the South China Sea under the control of China on Dec. 10.

China's Defense Ministry reportedly considers this act a serious military provocation and it has created tension between the two nations, according to Chinese state media. China said it will do whatever is necessary to protect its sovereignty, as well as to maintain peace and regional stability.

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China is claiming ownership of a large portion of the South China Sea. Aside from the Asian giant, five other neighboring countries are competing for territorial control over some areas in the same region.

The region is a collection of islets and reefs called the Nansha Islands in China, but others have come to know it as the Spratly Islands. China has reportedly constructed several facilities on the islands, and has increased its presence there, to the protest of neighboring countries such as Vietnam and the Philippines.

Chinese Foreign Ministry spokesman Hong Lei having said during the flying incident, the Chinese military went on high alert and immediately ordered the American bombers to leave the area, according to Xinhua.

"China takes the incident seriously," Hong said. "We once again urge the United States to seriously reflect upon and correct its mistakes, take effective measures to prevent similar, dangerous and provocative actions and stop any move that may undermine China's sovereignty."

However, the U.S. said that the bombers' flight over the territory was unintentional.

A statement released by the Pentagon said that they are looking into the matter. The flight apparently had no actual intention to fly within 12 nautical miles of the disputed area, as it was not a Freedom of Navigation Operation.

The phrase “Freedom of Navigation” is used to describe missions that intentionally violates airspace or water areas that are claimed by other countries under disagreeable circumstances.

This incidents - albeit unintentional - seems to have increased the tension between China and the U.S.

TagsUS, Nansha Island