Aug. 31, 1998: North Korea fires suspected missile over Japan and into the Pacific Ocean, calling it a satellite.
Sept. 13, 1999: North Korea pledges to freeze long-range missile tests.
June 2001: North Korea warns it will reconsider missile test moratorium if Washington doesn't resume contacts aimed at normalizing relations.
July 2001: US State Department reports North Korea developing long-range missile.
September 2002: North Korea pledges in summit talks with Japan to extend its moratorium on missile tests beyond 2003.
Jan. 10, 2003: North Korea announces withdrawal from Nuclear Nonproliferation Treaty.
March 10, 2003: North Korea fires a land-to-ship missile off east coast into waters between the Korean peninsula and Japan.
October 2003: North Korea fires two land-to-ship missiles.
May 2004: North Korea reaffirms its missile moratorium in summit talks with Japan.
May 2005: North Korea fires a short-range missile into waters between the Korean peninsula and Japan.
March 8, 2006: North Korea fires two short-range missiles.
June 18, 2006: North Korea vows to increase its "military deterrent" to cope with what it calls US attempts to provoke war.
July 5, 2006: North Korea launches seven missiles into waters between the Korean peninsula and Japan, including a long-range Taepodong-2.
July 15, 2006: UN Security Council adopts Resolution 1695 demanding North Korea halt missile program.
Oct. 9, 2006: North Korea conducts underground nuclear test blast after citing "extreme threat of a nuclear war" from US.
Oct. 15, 2006: UN Security Council adopts Resolution 1718 condemning test, imposing sanctions and banning North Korea from activities related to its nuclear weapons program, including "their means of delivery and related materials."
July 14, 2007: North Korea shuts down its main Yongbyon reactor, later starts disabling it.
June 27, 2008: North Korea destroys cooling tower at Yongbyon.
Sept. 19, 2008: North Korea says it is restoring a key atomic reactor.
Oct. 11, 2008: US removes North Korea from a list of states that sponsor terrorism.
Feb. 15: North Korea claims it has the right to "space development."
Feb. 23: South Korea says North Korea has a new type of medium-range ballistic missile capable of reaching northern Australia and Guam.
March 11: North Korea declares satellite launch will take place between April 4-8.
April 5: North Korea launches long-range rocket from its base at Musundan-ri on the country's northeast coast.