A Chinese non-governmental organization issued two reports on the military power of the United States and Japan. According to Chinese news agency (Xihnua), the two reports are in response to the irresponsible remarks on China\'s military affairs in the US Defense Department\'s annual reports, said Executive Vice-President of the China Strategic Culture Promotion Association Luo Yuan. The report on the US military said that the United States remains the world\'s biggest military power and warned China to keep on alert against the US strategy to \"return to Asia\" and possible attempts to intervene in the South China Sea issue. The report on Japanese military strength said the Japanese Self-Defense Force is a medium-scaled and well-funded regular army with advanced armaments and technologies. Foreign Ministry spokesman Hong Lei had expressed \"firm opposition\" to a Pentagon report that misrepresents China\'s military development. \"China\'s justified and normal military development\" had been unjustly criticized in the U.S. side\'s irresponsible remarks, he said. China has firmly adhered to its peaceful development path and adopted a defense policy which is defensive in nature, he said, adding that China is committed to the maintenance and promotion of peace, stability and prosperity in the Asia-Pacific region and the world as a whole, he added. (QNA)