Malaysia deployed naval vessels to the area, which were later backed by US warships that had been on joint exercises in the South China Sea. Beijing claimed it was conducting "normal activities in waters under Chinese jurisdiction," but for years Chinese vessels have been accused of hounding countries who try to explore for resources in waters that China claims as its own.
Now, experts say the Chinese ships are adopting increasingly forceful tactics, which risks sparking new conflicts with major regional powers such as Malaysia and Indonesia.