Earlier quoted context omitted.
I'm not sure which parts do you find questionable. The common geopolitical interests - true as long as you believe Poland is more comfortable with the West rather than in "Eurasian Union". Nordic countries are way more liberal, but they are wary of Russia. Historically Russia was often in conflict with Poland. Scandinavian Peninsula can be a great obstacle to Russia if it wants to expand west. It threatens sea routes…
I was referring to Poland, but I am now even more intrigued as I never explored Hungary's history as much. Thank you for sharing the books -- I added them to my reading list. Can you expand on the Poland and Finland?
As for Finland, it's the more superficial things. Wars against Russia, desire to be independent, and Finland fought Russia very effectively in the defensive Winter War. Both Poles and Finns are heavy drinkers.
Since you seem to like this kind of books: Timothy Snyder is an US historian specializing in Eastern Europe, and he's especially fond of Ukraine. He also has good lectures on youtube, although I think he's trying too hard when he's commenting modern politics.
Norman Davies is an English-Polish historian with a particular interest in Poland. He speaks the language surprisingly well. The books I'd recommend include: "Red Star, White Eagle". He described an unlikely outcome when in 1920 Poland won a war against Bolshevik Russia, and delayed the onset of communism in Europe.