Lyric discussion by hdodds 

I'm pretty certain that I read that Eldritch said that Mother Russia was about how West Berlin should be given to the Soviets. These lines really reinforce the idea that it's about Berlin, imo:

"There's a lighthouse in the middle of Prussia A white house in a red square"

On East German maps, West Berlin was left as blank white space, therefore, the White House is both a real thing and a metaphor. In the metaphorical interpretation, it's saying that there's a little piece of America in the middle of what is essentially the USSR.

As for the lighthouse - if it's in the middle of Prussia it's safe again to assume it's Berlin.

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