Editor’s note: what the hell is the US even doing there and also running war drills in the seas right next to Russia?

China deployed two fighter jets and three warships Tuesday after a US navy ship sailed close to a disputed reef in the South China Sea.

Guided missile destroyer, the USS William P. Lawrence, traveled within 12 nautical miles of the Chinese-occupied Fiery Cross Reef to “challenge excessive maritime claims,” said US Defense Department spokesman Bill Urban.

These excessive maritime claims are inconsistent with international law as reflected in the Law of the Sea Convention in that they purport to restrict the navigation rights that the United States and all states are entitled to exercise,” Urban said in an emailed statement to Reuters.

Under UN maritime law, all ships – including military vessels – are afforded the right of “innocent passage” through territorial waters so long as that ship travels without any threat against the sovereignty, peace or security of the coastal state.

South China Sea island

Chinese dredging vessels are purportedly seen in the waters around Fiery Cross Reef in the disputed Spratly Islands in the South China Sea in this still image from video taken by a P-8A Poseidon surveillance aircraft provided by the United States Navy May 21, 2015.

However, the US is not a signatory to the UN convention.

China has accused the US of threatening peace in the region, saying that the warship illegally entered Chinese waters near the reef.

Chinese Foreign Ministry spokesperson Lu Kang told Xinhua that the US naval actions threaten “China’s sovereignty and security” and are designed to disrupt maritime conduct.

China’s Defense Ministry said the US patrol “again proves that China’s construction of defensive facilities on the relevant reefs in the Nansha Islands is completely reasonable and totally necessary.”

The new development is just the latest in a long-running dispute regarding the South China Sea, which both the US and China accuse each other of militarizing.

‘Nansha Islands’ is the Chinese name for the disputed Spratly Islands where some of China’s expanding land reclamation work, including a 3,000-meter (10,000ft) runway, is taking place.

In response, the US has increased its naval patrols and exercises in the area.

SEE ALSO: Before and after images of Chinese military bases in South China Sea

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