From the 1979 hostage crisis to strikes on Iran’s nuclear sites, US-Iran tensions have simmered for decades. But are Trump’s latest threats against the ayatollahs serious? Or will imminent talks in Muscat cool the discord?

Explainer 503: Why is the US making nice with West African juntas?
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The capture of Nicolás Maduro: a new horizon for Venezuela and American foreign policy?
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Explainer 502: The two-man rivalry fuelling South Sudan’s civil war
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