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The Russian government wants to devalue the rouble but isn’t sure how. This, in a nutshell, explains Moscow’s latest currency crisis, which sent Russian stock markets in a tailspin and prompted the authorities to close the exchanges for the umpteenth time in recent weeks. The Kremlien’s public and bizarre mulling of the situation is making things worse. And none of its options – a soft landing, a hard devaluation or allowing the rouble to float – is pleasant. With oil prices now under $60 a barr...