Thanks for keeping discussion going. It's difficult to sum up centuries of events. (I wasn't aware of MacKay, interesting!) Look up "Pale of Settlement" then Bolshevik revolution. Not all Warsaw pact joined NATO. Ukraine didn't get admitted but has status just to allow say Canadians to come in. Under post war many Ukrainians migrated to Canada (V Freeland) bringing their heritage here and that's not only perogeys.