A Chinese warship sailed within yards of an American destroyer -- forcing it to change course -- in an "unsafe and unprofessional" encounter as the US vessel was in contested waters in the South China Sea, an official said Monday.

The USS Decatur guided-missile destroyer was conducting what the military calls a "freedom of navigation operation" Sunday, when it passed within 12 nautical miles of Gaven and Johnson reefs in the remote Spratly Islands.

The 12-mile distance is commonly accepted as constituting the territorial waters of a landmass.

China claims nearly all of the South China Sea, though Taiwan, the Philippines, Brunei, Malaysia and Vietnam all claim parts of it.

Beijing claims all of the Spratlys and has built a number of military installations on the islands.

During the operation, a Chinese Luyang destroyer approached the USS Decatur in "an unsafe and unprofessional maneuver in the vicinity of Gaven Reef in the South China Sea," US Pacific Fleet spokesman Commander Nate Christensen said.

The Chinese ship then conducted a series of "increasingly aggressive maneuvers, and warned the Decatur to depart the area," he added.

The Chinese "destroyer approached within 45 yards (meters) of Decatur's bow, after which Decatur maneuvered to prevent a collision."

In a statement, the Chinese Ministry of Defense said that its ship had "given a warning to leave" to the vessel after it entered the area "without permission."

"The US has repeatedly sent warships into the territorial waters near Chinese reefs and islands in the South China Sea," it said.

The behavior "gravely threatens China's sovereignty and security, gravely damages relations between China and the US and their militaries, and gravely injures regional peace and stability."<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/1798400013?profile=original" target="_self"><img src="https://storage.ning.com/topology/rest/1.0/file/get/1798400013?profile=RESIZE_1024x1024" class="align-full" width="750" /></a></p>Chinese warship warns American destroyer to leave contested waters of the South China Sea before sailing within yards of the ship forcing it to change course, US says

https://sg.news.yahoo.com/chinese-destroyer-extremely-close-us-warship-us-203700989.html