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The Saudi-backed government is hobbled; separatism is spreading; a humanitarian crisis grows by the day. A rebel advance on a once-safe city will only prolong a grinding war. We look at the scourge of doping in horse racing ahead of this weekend\u2019s Belmont Stakes. And the last surviving foreign fighter in Spain\u2019s civil war was a revolutionary to the end. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer