US destroyer sails close to contested island in South China Sea

The same day, Chinese Navy announced it would hold live fire drills in the sea, in what it called a "routine arrangement" designed to test its combat readiness.

The US Navy conducts regular Freedom of Navigation operations in the region with the unstated goal of challenging China's huge, disputed territorial claims in the South China Sea.

On Friday, the USS Mustin sailed close to Mischief Reef in the Spratly Islands, an island chain also claimed by the Philippines, the US Navy said.

"All operations are designed in accordance with international law and demonstrate that the United States will fly, sail and operate wherever international law allows," Nicole Schwegman, US Pacific Fleet spokeswoman, said.

The Chinese government has laid claim a large swathe of territory in the region, overlapping areas claimed by other countries including Vietnam and the Philippines.

To reinforce its position, Beijing has reclaimed land and constructed military assets on a series of reefs in the Spratly and Paracel island chains in the South China Sea.

In October 2017, the US Navy destroyer USS Chafee also sailed close to the Paracels, provoking a stern reaction from the Chinese Defense Ministry. "(We are) firmly opposed to such flaunting of force and promotion of militarization in the region by the US, which could easily trigger accidents at sea and in the air," it said in a statement at the time.

On Friday, the Chinese Navy announced it would hold live fire drills in the South China Sea at an undisclosed date and location.

According to state media, the navy will hold the drills "in the near future" but didn't elaborate further on their timing or what they would entail.

"The purpose is to test and improve the training level of the troops and comprehensively improve the ability to win," state media said.

The drills do "not target any particular country," the report added.

For many years the South China Sea has been considered an international flashpoint, as the US and China attempt to assert their influence in the region.

But the ongoing nuclear crisis in North Korea and a distracted US government under President Donald Trump has diverted attention from the area, allowing the Chinese government to tighten its hold.

"The Chinese continue to pace with their long-term strategy to gain de facto control over the sea lanes in the South China Sea. And what changed is the United States stopped paying attention," Michael Fuchs, a senior fellow at the Center for American Progress, told CNN in December.