Japanese Coast Guard trades heavy fire with vessel suspected of being North Korean spy ship, causing it to sink just inside economic zone claimed by China; Prime Min Junichiro Koizumi calls for increased territorial vigilance; sunken ship's entire crew of 15 is believed to have drowned (M)

https://www.nytimes.com/2001/12/24/world/koizumi-calls-for-vigilance-after-japan-sinks-suspicious-boat.html