i hear you, but i do not fully agree with the analogy...
when i say Russia i mean Russia
when i mean the Soviet Union i say CCCP
when i say UK i mean England, Scotland, Wales etc
when i mean England alone i say England
OK, I see But that's you.
I know (at least in 1980-s) many people in the West used to say "Russia" instead of the USSR. I just heard about that.
And here (in Russia), many people still use "England" to name the entire UK. It is very common at least in my country.