BEIJING, Sept. 23 (Xinhua) -- China expresses strong dissatisfaction and firm opposition to the irresponsible remarks by the United States, Japan and the Republic of Korea (ROK) on Taiwan and maritime affairs, a foreign ministry spokesperson said Tuesday. Spokesperson Guo Jiakun made the remarks at a regular press briefing in response to a joint statement by the three countries, saying they had interfered in China's internal affairs and sought to slander and defame China.