This is where it gets dicey, what about Turkey. What if Turkey decides to drag NATO in it, in the hope that eliminating Russia as a threat, will allow Turkey to finally achieve its ambition of rebuilding The Ottoman Empire?
what about Turkey. ...
If Turkey is attacked by Russia then Nato would be obligated to defend. If Turkey attacks, no obligations by the other members.
Turkey is a hard call. They have disregarded Nato obligations in the past. Nato might disregard them in the future.