...Oil prices have fallen sharply, with Brent crude dropping from USD115/b in mid-June to close to USD80/b. Initially, lower oil prices will primarily affect sovereign credit fundamentals through their fiscal and external positions. Fitch rates 10 sovereigns where oil revenues account for more than half of both general government and current external receipts; and others where oil revenues provide a substantial proportion of public sector revenues, and/or the bulk of current external receipts....