A U.S. aircraft carrier has sailed through the disputed South China Sea in the latest show of America's military might amid new territorial flare-ups involving China and three rival claimant states. China says it will take "countermeasures" if the United States deploys ground-based intermediate-range missiles in the Asia-Pacific region. Fu Cong, the director of the Foreign Ministry's arms control division, told reporters Tuesday that Beijing "will not stand idly by" if Washington follows through