俄國

Etymology
From + ; attested as early as 1838, in the .

Proper noun

 * 1)  Soviet Russia
 * 1)  Soviet Russia
 * 1)  Soviet Russia

Usage notes
is more commonly used when referring to the modern country (instead of the historical Russian Empire), while is typically used to refer to the former Russian Empire. But if is used as an attributive, it is equivalent to  (e.g.  and  both refer to "a Russian person, Russian people".)