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The UN Charter and Security Council were supposed to prevent aggressive wars. Who has broken the rules, and how much damage has that done? It is often said that the great powers have always done what they wanted and ignored international law. But will new forms of war present even more of a challenge?

Presenter: Afua Hirsch\\nProducer: Lucy Bailey

(Photo: Illustration of a knitted ball resembling Earth unravelling. Credit: Nadia Akingbule)