This is an especially big problem with a badly defined word like this,
Edit: I wrote this comment, clicked through, and of course Eco is the first writer referenced.
The original article also does not really fit the Socialist Russia that much. It was seeking world domination and did not minded to start a war, but that is the thing - it was concerned more with reality of winning then with appearance of strength for aesthetic purposes. It had own machismo, it had disdain to intellectualism, but both did in fact limited its capabilities.
Lasted longer than the Nazi empire, I'll admit, but both were weak
but fascist in the original sense -- as created by mussolini -- was aggressive nationalism combined with corporatism, and a reclaiming of lost glory (revanchism)
george w bush's america is closer to classical fascism than stalin would ever be