Just a bit of it.
"North Korea's Weapons Capabilities Have Grown Under Bush
Timeline: Under Bush, Situation With North Korea Worsened
2001: Bush Contradicted Powell on North Korea, Said No Plans for Negotiation With North Korea. During a meeting with the president of South Korea, Bush expressed a hard line approach to North Korea that contradicted Secretary of State Colin Powell's earlier statements. One day before Bush met with the President of South Korean, Powell said that the Bush administration planned "to pick up where President Clinton left off." (USA Today, 3/8/01)
2001: North Korea Pursuing Nuclear Arms Program Aggressively Since 9/11. Since 9/11, North Korea has accelerated their nuclear efforts. A report by the National Security Advisory Group issued in July of 2005 states that "North Korea's runaway nuclear program could be a direct path to nuclear terror. . . . North Korea sells missiles and other dangerous technology worldwide, with no apparent limits or compunction . . . (the country's) leaders and elite engage in smuggling, counterfeiting, and other illicit activities. These same people might traffic in nuclear materials the way A.Q. Khan trafficked in Pakistan's nuclear technology." (Worst Weapons in Worst Hands, the National Security Advisory Group, July 2005)
2002 to 2003: Under Bush's Watch, North Korea Withdrew from the Non Proliferation Treaty. Between December 2002 and January 2003, North Korea ejected IAEA inspectors and announced its withdrawal from the Non Proliferation Treaty. (Arms Control Today, July/August 2006)
2003: CIA Informed Foreign Officials North Korea Had Small- Nuke Technology. The CIA informed South Korean and Japanese officials that North Korea began testing conventional primary explosives associated with advanced nuclear warheads. Smaller nuclear warheads, which the CIA suspected North Korea possessed, could increase the deliverable range of North Korean missiles and places U.S. forces in Japan (roughly 60,000) and South Korea (roughly 35,000) well within range. The CIA also found that the North Koreans had a conventional weapons test site that was capable of testing nuclear weapons. (New York Times, 7/1/03)
2003: Bipartisan Senators Criticized Bush Administration Policy on North Korea as Inadequate. During testimony by Deputy Secretary of State Richard Armitage, the two ranking members of the Senate Foreign Relations Committee, Committee Chairman Richard Lugar (R-Ind.) and Ranking Member Joseph Biden (D-Del.), criticized the Bush administration's policy on North Korea as inadequate. Calling the Bush administration's North Korea policy "largely reactive and predictable," Biden ordered the administration to regain the initiative on discussions. Lugar said that Bush should show "immediate U.S. leadership" by increasing dialogue and selecting a senior coordinator for the policy. (Washington Post, 2/5/03)
2003: North Korea Claimed They Could Produce Half-Dozen Nuclear Bombs. North Korean officials said that they had finished producing enough plutonium to make a half-dozen nuclear bombs and that they would move ahead quickly to turn the material into weapons. (New York Times, 7/15/03)
http://releases.usnewswire.com/GetRelease.asp?id=74135Starts in 2001 and continues research to the present.