4:05am, Wed 19 Sep 2012 Anti-Japan protests intensify Last updated Wed 19 Sep 2012
Aerial photo of Chinese ocean surveillance, fishery patrol ships and Japan Coast Guard patrol ship Credit: Reuters/Kyodo
China's commerce ministry has called on Japan to take "complete responsibility" for any trade impact from a territorial dispute between the two countries over a string of islands it both claims.
Last week, Chinese Vice Minister of Commerce Jiang Zengwei said tensions between China and Japan are likely to harm trade ties between the two countries.