The daring freedom of navigation operation by the US, mainly aimed at China, was first reported by The Wall Street Journal in a lead story.
"A US warship conducted a patrol Saturday around an island in the South China Sea claimed by China and two of its neighbors, another in a series of operations intended to challenge Beijing's maritime and territorial claims in the region," the daily said.
"I can confirm the Department of Defense conducted a freedom of navigation operation in the South China Sea on Jan 30 (Jan 29 EST), specifically in the vicinity of Triton Island in the Paracel Islands, to challenge excessive maritime claims," Commander Bill Urban, a Pentagon spokesman, told PTI in response to a question.
This operation challenged attempts by the three claimants, China, Taiwan and Vietnam, to restrict navigation rights and freedoms around the features they claim by policies that require prior permission or notification of transit within territorial seas, he said. The excessive claims regarding Triton Island are inconsistent with international law as reflected in the Law of the Sea Convention.
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According to the daily, the operation lasted about three hours, during which there were no Chinese army or navy seen in the area. "We saw nothing that was unusual in terms of the reaction," a senior defense official was quoted as saying.
The US takes no position on competing sovereignty claims between the parties to naturally-formed land features in the South China Sea, Urban reiterated.
"No claimants were notified prior to the transit, which is consistent with our normal process and international law," he said. This operation demonstrates, as US President Barack Obama and Defense Secretary Ashton Carter have stated, the US will fly, sail and operate anywhere international law allows.
"That is true in the South China Sea, as in other places around the globe," Urban said.