As Gulf leaders convene for the 46th GCC summit during a tense time for the region, we discuss what role the US could play in a joint defence plan. Plus: Design Miami, how taxes might have birthed civilisation and the International Luxury Travel Market in Cannes.

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Live from Zürich, which has just topped an index of the world’s smartest cities
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The Mecca defence pact and Meloni’s record-breaking run
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