>>183619240In English? It's hard to explain, because 'russian' is natural adjective derived from destroyed medieval state Rus (Pycั), but also used as an adjective of modern state Russia (Poccะธั). The second usage is more common, so the main difference is about accenting on the ancestry or derivation of certain existing country. This is why Belarus is more preferred name to Belarussia, for example. Did I understood your question right?