Back when I had a clearance, I had to report my foreign travels. I was cautioned that Russia (also Soviet Union when that was still a thing) spied on all foreign visitors into their country, and also on as many American visitors as they could in Europe. Sweden, where I was headed, was a juicy target because they were neutral and easy for Russsian/Soviet spies to get into. I don't know if that "Norwegian Government Tourist Official" and his "American wife" were really who they said they were, or if maybe they were trying to make friends with a traveling American Engineer with a Secret/Crypto clearance for other reasons other than that they just liked me. They bought me a lot of beer, and I put them in my post-travel report.