MOSCOW (Reuters) - The Kremlin is trying to reassure residents of Crimea, left in the dark after electricity supplies from Ukraine were cut off, that it is coming to their rescue by installing a power link with Russia. A customer visits a grocery lit with candles due to a power cut, in Simferopol, Crimea, in this November 22, 2015 file photo. REUTERS/Pavel Rebrov/Files But the reality is that it w