On leaving the EU...but not Europe

I certainly did not expect to see a rather large team of Hungarian border control/military when I was crossing the Hungary-Romania border. Then, when the train was in Romania, the same thing on a smaller scale happened with Romanian border control/military. Interestingly, to me at least, was the purple camo outfits the Romanian border control/military was wearing. I'm not a fan of camo, but the purple was not as ugly as the green.

Oh, and Romania is not EU.