NATO is the world's biggest military alliance, bringing together 30 European and North American countries who commit to defend each other in the event of attack. After Finland joins on Tuesday, it will have 31 members.
The alliance was formed at the start of the Cold War to protect Western Europe against the threat of Soviet aggression but its remit and reach have expanded over time.
Here is a brief history of the organisation:
- Containing Soviet threat -
The North Atlantic Treaty Organization is founded on April 4, 1949, by 12 countries alarmed by the Soviet Union's drive to install communist regimes across Eastern Europe.
The original signatories of the founding Washington Treaty are Belgium, Britain, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal and the United States.
The treaty's key Article 5 states that "an armed attack against one or more of them in Europe or North America shall be considered an attack against them all" and requires a reaction, "including the use of armed force".
Moscow's response is to set up a rival club of 12 communist countries called the Warsaw Pact.
- Balkan wars -
After the Soviet Union falls apart in 1991, NATO gets drawn into the Balkan wars.
In 1994, the alliance conducts its first combat operation, sending fighter jets to Bosnia-Herzegovina to enforce a no-fly zone.
In 1999, it carries out a 78-day bombing campaign in Serbia over Belgrade's bloody crackdown on the breakaway province of Kosovo.
But the 1990s also bring outreach with Russia and its former allies.
In 1997, NATO signs a political "founding act" with Moscow, stressing that they "do not consider each other as adversaries" and two years later the first ex-communist countries join the club -- the Czech Republic, Hungary and Poland.
- 'War on terror' -
NATO's "one for all and all for one" pledge is invoked for the first time after the 9/11 attacks on the United States, carried out by the Al-Qaeda terror network.
NATO joins the US-led "war on terror" in 2003, taking the lead of the International Security Assistance Force (ISAF) deployed to Afghanistan to root out Al-Qaeda and other Islamist militants.
NATO's combat mission in Afghanistan ends in 2014, but NATO allies only withdraw fully seven years later sparking a collapse of Western-trained Afghan forces and a takeover of Afghanistan by the Taliban.
Meanwhile, as the European Union expands, so does the alliance, with Bulgaria, Romania, Slovakia and Slovenia joining in 2004.
The admission the same year of the three ex-Soviet states of Estonia, Latvia and Lithuania particularly annoys Russia.
- Libya intervention -
NATO's seven-month campaign of air strikes leads to Kadhafi's overthrow. Russia and China accuse NATO of using its mandate as a cover for regime change.
- Standoff over Ukraine -
In April 2014, NATO suspends all cooperation with Russia over its annexation of Crimea and support for pro-Russian rebels in eastern Ukraine.
In 2016, NATO deploys four multinational battalions to Poland and the Baltic states, marking the biggest reinforcement of NATO's collective defences since the Cold War.
On February 24, 2022, Russia invades Ukraine, a NATO partner country that has for years attempted to join the alliance.
NATO does not intervene directly, but its members send Kyiv billions of dollars in weapons and the alliance boosts its eastern flank with four new battlegroups -- in Romania, Bulgaria, Slovakia and Hungary.
Fearing being future targets of Russian aggression, Finland and Sweden, which have been non-aligned for decades, apply for NATO membership.
On March 30, 2023, Turkey is the last NATO member to approve Finland's membership, clearing the way for it to become NATO's 31st member.
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© Agence France-Presse
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