Japan's Defense Minister Shinjiro Koizumi has slammed China for bolstering its military capabilities "without sufficient transparency." Koizumi's comments came as he spoke at the annual Shangri-La Dialogue in Singapore on Sunday. The minister said China continued to expand defense spending at a high level and the country's military activities were a matter of "serious concern" for Japan and and the international community. Ties between the Asian countries have been at their worst in years ever