(Reuters) – Six weeks after Russia sent troops into Ukraine, the rouble has staged an apparently extraordinary recovery, but all is not what it seems and the exchange rate used in everyday transactions is sometimes very different to the official one. The rouble’s swift rebound on the Moscow Exchange to levels seen before Feb. 24 is being touted in state media and by some government officials as evidence that authorities have got a firm grip on the country’s finances despite being battered by the toughest Western sanctions ever. “Our economy appears to be resilient to Western sanctions, the rou…