It comprises more than half of the world's defence spending, but what is the North Atlantic Treaty Organisation? How has the United States influenced it from its inception to today? And how, during its 75 years, has it impacted the United States in return?

Don is joined by Peter Apps, journalist and Reuters global defence commentator. From the signing of the treaty by the first 12 members on 4th April 1949, through tensions, failures and the addition of member states, how might NATO be 'the world's most successful military alliance'?

Produced by Sophie Gee. Edited by Ella Blaxill. Senior Producer was Charlotte Long.

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