February 11, 1991 - The Warsaw Pact is dissolved.
December 13, 1991 - For the first time, the Soviet Union takes part in meetings at NATO as part of the North Atlantic Cooperation Council (NACC).
December 21, 1991 - Eleven of the republics of the former Soviet Union create a new Commonwealth of Independent States.
December 25, 1991 - The Soviet Union is officially disbanded with the resignation of Mikhail Gorbachev as president and supreme commander-in-chief of Soviet Forces.
February 28, 1994 - NATO forces shoot down four Bosnian Serb planes violating the U.N.-imposed no-fly zone. It is NATO's first military engagement in almost 50 years of history.
November 21, 1995 - After the Dayton Peace Accords, the war in Bosnia Herzegovina ends.
December 20, 1995 - The U.N. turns over military operations command to NATO's Implementation Force (IFOR).
January 13, 1996 - Russian troops deployed to support IFOR in Bosnia.
May 22, 1997 - NATO and the Russian Federation sign a security and cooperation pact, the "Founding Act" which establishes a NATO-Russia Permanent Joint Council (PJC).
March 24, 1999 - NATO launches air strikes against Yugoslavia to end Serbian aggression in the Kosovo region.
April 4, 1999 - 50th anniversary of founding of NATO, celebrated in various countries throughout the year.
August 22, 2001 - Operation Essential Harvest, the disarming of ethnic Albanians in Macedonia, begins.
September 12, 2001 - For the first time, NATO invokes article V, the Washington Treaty, its mutual defense clause, in support of the United States after the terrorist attacks.
May 14, 2002 - The last meeting of the NATO-Russia Permanent Joint Council
May 28, 2002 - NATO and Russia form the NATO-Russia Council (NRC), which makes Russia an associate member of the organization. The NRC replaces the Permanent Joint Council (PJC) that was established in 1997 by the NATO-Russia Founding Act.
November 21-22, 2002 - During the Prague Summit, NATO invites seven former Eastern Bloc countries, Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia and Slovenia, to discuss entry into the organization.
December 4, 2002 - Deputy Defense Secretary Paul Wolfowitz speaks before NATO in Brussels and requests that member nations contribute forces to a potential campaign in Iraq.
January 22, 2003 - France and Germany block discussion on war preparations submitted by the United States. The U.S. proposal included provisions for Turkey's defense, the use of NATO equipment, and NATO's postwar role in Iraq.
January 23, 2003 - Secretary General Lord Robertson announces his intention to step down in December.
February 10, 2003 - France, Germany and Belgium block a U.S. request that NATO provide Patriot missiles, Airborne Warning and Control System (AWACS) aircraft, and other equipment to Turkey. The United States had made the request anticipating that Iraq will retaliate against Turkey in the event of war. Turkey invokes article IV of the NATO charter, which requires the organization as a whole to discuss security threats to any member nation.
February 11, 2003 - A meeting to discuss the standoff over Turkey's defense preparations ends after 20 minutes with no resolution.
February 16, 2003 - NATO comes up with three defensive plans for Turkey, in the event of a U.S. war with Iraq: - deployment of NATO Airborne Warning and Control System (AWACS) aircraft; - NATO support for the deployment of theatre missile defences for Turkey; - NATO support for possible deployment of Allied chemical and biological defences. (from NATO website)
February 19, 2003 - NATO deploys defensive assistance to Turkey in the form of missiles, chemical and biological defense mechanisms, and aircraft, in the event war with Iraq presses forward.
January 5, 2004 - Jaap de Hoop Scheffer of the Netherlands becomes the new secretary general.
March 29, 2004 - NATO is expanded from 19 to 26 members when the seven nations Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia, and Slovenia, join in an accession ceremony in Washington, DC. All are former communist states in Eastern Europe.