Plenty of wheat producing land--check. Their ports mostly suck, and they're sooooooooooooooo far apart. Their Black Sea fleet is trapped in by the narrow straights through the Istanbul/Constantinople area. Their Baltic fleet is trapped in by the narrow straights through Denmark. That leaves the North and the Far East. The rest of the world has its measures of superpower status. The Russians can live as emperors in their own heads, I suppose.