When I was stationed at Ft. Devens MA in 1973, it was the Army Security Agency Training Center and School. Soviet “fishing trawlers” were always off the MA coast, far enough out to be in International Waters. They had bid antenna and radar dishes, they were trawling alright but not for fish. There really isn’t much you can do to a ship in international waters. Unlike the Israelis, we can’t send patrol boats and jets to attack it, like they did with the USS Liberty, and unlike the North Koreans, we can’t go out and capture it like they did the Pueblo. I’m sure we have our ships near the Russian coasts as well at times.
I was in the Canal Zone before Jimmy Carter gave it away, there were always Russian Trawlers anchored about. Amazing that a simple fishing trawler needed so many antennas.