You are right that in English (and a few other major languages) it is "Russia". Also right that the OP has the Spanish version. I do not think it is "Rusia" in any other languages, but Spanish is not bad. I have the French version (russie.mobi).
Value depends on several factors. Clearly not as valuable as "Russia" (which was held back by mTLD), but it should hold some interest for spanish speakers. When I try to evaluate foreign language geo names, I look at the number of speakers, the proximity of those speakers to the particular location, whether there are paid Google ads for that term, etc. If you know any Spanish, you could market it to travel/tourism agencies. Good luck.
MM