If you could live anywhere, where would it be? (off topic)

Actually, it is "us", not "we".  "Us" is a direct object. (Sorry, it's hard to resist correcting grammar sometimes!)

Don't mean to be antagonizing, but I believe you are mistaken. I'm sure you are familiar with the phrase: "we the people" right? Obviously, it is not "us the people." 

There are many other examples I could give as well, but the correct grammar is actually "we" in this case. Just because it is a common error, that doesn't mean that "us" is correct simply because it is said somewhat frequently

I wanna live in Japan :>

In my room, I'M in my room... rn

Joker likes it too

Excuse me, but the phrase "we the people" is used as the subject in its most famous context.  That is entirely different from your use of the phrase "we Soviets".  (No offense intended; I am not trying to pick a fight-- I'm just an appreciator of the English language!)

In my dreams

I often wander about that. I mean the trips there and back could get a little boring, but you'd be ON Mars and that is cool!