Personally, I wouldn’t think so. Here’s why:
1) The nations’ strength/ health are reliant on their economy and position in the world. Russia also had this super strength.
2) The nations themselves are already noted to be strange beings. The super strength is just an ability that comes with part of their existence. In other words, while it’s not common, it’s still a natural feature.
All of them can attain it if their country is strong enough. Meanwhile, seeing spirits/ magical creatures is more dependent on their populations’ cultural belief in them.
Ellawritesficssometimes 