Taiwan President Chen Shui-bian says information provided by Taipei helped Japan locate a Chinese nuclear submarine in Japanese waters last week.
Mr. Chen said Friday that Taiwan provided intelligence to Japan and the United States, alerting them to the intrusion.
He emphasized the threat from China, and the common interests among Japan, the United States and Taiwan in maintaining peace and stability in the Asia-Pacific region.
Last week, Tokyo demanded an apology from Beijing after the intrusion into its southern waters, which set off a two-day high-seas chase.
Beijing initially refused to accept the protest or make an apology, saying it was still investigating the matter.
But earlier this week China expressed regret for the intrusion.
Some information for this report provided by AFP.