China's military took "immediate action" on May 27, 2018, against "unauthorized" sailing by US warships in South China Sea waters claimed by Beijing.
China's defense ministry said in a statement that two US warships, the Antiem guided missile cruiser and the USS Higgins destroyer, entered disputed waters around the Paracel Islands before the Chinese navy intervened in what it considers to be a "serious infringement on China's sovereignty."
"Chinese military took immediate actions by dispatching naval ships and aircrafts to conduct legal identification and verification of the US warships and warn them off," Wu Qian, defense ministry spokesman, said.
The spokesman also called the US move "provocative and arbitrary," which he said "undermined strategic mutual trust between the two militaries."
China has held de facto control over the Paracel Islands since 1974, however Taiwan and Vietnam also have competing claims to the area. The US warships reportedly came within 12 nautical miles of the islands.
Satellite view of one of the islands part of the Paracel Islands in the disputed South China Sea.
According to Reuters, the US freedom of navigation operation was a targeted measure against China's growing influence in the region.
The move comes at a sensitive time between the US and China. In May 2018, the Pentagon disinvited China from an international military exercise in an effort to send a message about the country's activities in the South China Sea.
"China's continued militarization of disputed features in the South China Sea only serve to raise tensions and destabilize the region," Department of Defense spokesman, Lt. Col. Christopher Logan, said in a statement.
In addition, the US has been sparring with China over trade imbalances as the two nations continue talks to prevent an all-out trade war.
President Donald Trump also called out China in May 2018, for having a "porous" border with North Korea, and reports indicate Chinese companies have increased trade with North Korea.
In April 2018, Chinese ships reportedly gave a "robust" challenge to three Australian warships in the South China Sea that were en route to Vietnam.
This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.
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