So what? Old French Bretaigne referred both to Britain and Brittany, Old French Russie referred to both Russia (maybe, haven't done research on this) and Ruthen

So what? Old French Bretaigne referred both to Britain and Brittany, Old French Russie referred to both Russia (maybe, haven't done research on this) and Ruthenia. But we're not speaking Old French, we're speaking 21-century English. In 21-century English, Russia ≠ Ruthenia, Brittany ≠ Britain. The quote you've provided is irrelevant.