The Poland-Denmark-Norway-Iceland-Sweden region seems incorrect. Also I'm not sure how to read Finland-Estonia-Russia or Cyprus-Israel-Turkey sections, the map would be clearer if the splits happened only in nodes (ie countries) and not in-between.

Overall the map seems hugely simplified wrt Europe, which I believe to be far more interconnected. If simplification is desired then imho it would almost be better to just bunch all of Europe as single node