China's military says it 'drove away' U.S. destroyer near Scarborough Shoal
The shoal has been a major source of tension in the South China Sea, a conduit for more than $3 trillion of annual ship-borne commerce.
Tomas Kauer - News Moderator 
The shoal has been a major source of tension in the South China Sea, a conduit for more than $3 trillion of annual ship-borne commerce.
