China Japan tensions 'troublesome', says US general

Tensions between China and Japan have escalated recently over a group of islands to which both lay claim.

Last month, Japanese Prime Minister Shinzo Abe said the two countries were "in a similar situation" to Germany and Britain just before the outbreak of World War One.

US General Herbert Carlisle, the commander of US air forces in the Asia Pacific region, has told the BBC that a conflict between the two countries would be devastating for the world economy.