First point, after world war one parts of Hungary were ripped away and given to Romania, so I guess you might say that Romania is a threat to the EU. Second point, It seems to me that all threats from that part of Europe started in Austria.
SO, you believe that Russia and the Soviet Union has never been a threat to Europe?
I have traveled through Romania. The Hungarians set themselves apart and the Romanians feel hostility from them.
On a lighter note, it was Christmas time when I was there, and the street corner a Santa Claus wore a GREEN and white Santa suit ( the colors of the Hungarian flag) and instead of saying “ho, ho, ho. “ he said “He, he, he.”