Japan has released its annual defence white paper, calling China's military activity a "grave concern". It highlighted the increasing presence of the Chinese military around Japan in the past year — such as near the disputed Senkaku Islands, which China also claims and calls Diaoyu. The white paper also raised alarm bells over the speed of North Korea's missile development. Japan's defence budget is expected to rise to 1.8% of its GDP this fiscal year. Michiyo Ishida reports.