It's a frightening scenario: American troops – backing their Japanese allies – drawn into a conflict with China. And fighting over nothing more than some uninhabited islands and a few rocks. Senkaku is privately administered by the Japanese, but the Chinese claim they are the rightful owners. While officially neutral, the US defense treaty means it would have to back Japan in a military confrontation over these islands. As the U.S. and Japan begin military exercises in the region, tension is rising. Chris Lawrence reports.