Already a year after NATO was formed, communist North Korea - with Soviet support - attacked neighboring South Korea.

An event that contributed to the fear of an aggressive Soviet communist regime.

In 1955, West Germany joined NATO and the Iron Curtain between East and West became increasingly clear.

Identity crisis

Over the years, Soviet power diminished and when the Soviet Union finally collapsed in 1991, this meant an identity crisis for the defense alliance.

In the 1990s, it was therefore debated whether NATO really had any purpose.

But as Putin's aggression has increased, it has become clearer who the alliance's old and main enemy is.

Click on the clip to hear more about NATO's history and see more about Russia's relationship with the Defense Alliance in the Foreign Office: Who is afraid of NATO?

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