First North Korean nuclear test: October 9, 2006, and Bush did nothing about it

And neither did anyone else:

The United States Geological Survey reported that a seismic event occurred at 01:35:28 UTC (10:35:28 am local time, UTC+9) on October 9, 2006, and measured 4.3 on the Richter scale. It occurred at the geographic coordinates 41°17′38.4″N 129°08′2.4″E with a horizontal location uncertainty of ±9.6 km (6.0 miles). This is near Mantapsan, 73 km (45 mi) north of Kimchaek, 90 km (56 mi) southwest of Chongjin, 180 km (110 mi) south of Yanji, and 385 km (239 mi) northeast of Pyongyang.