Negotiators are again meeting face-to-face, this time in Istanbul. There is little hope of reaching an agreement at this stage—and even less that it would be adhered to. The metal cages appearing atop Russian tanks are intended to counteract anti-tank munitions; in practice their biggest effects seem to be psychological. And the extraordinary heatwave hitting the Antarctic.For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer
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