It's for captains only. But the main problem for any foreigner will be medical, which is totally different from your JAR-3FCL. It's complicated, but good analogy would be, the requirements we have in Russia for civil pilot are like what you have for mil pilots in the West. These will not be waived for foreing captains, no exceptions. To say just one thing, new candidates must pass RECTAL (yeah, anal) test where they put an endoscopic camera in your ass to see if you have lacerations in your colon. Same thing goes for stomach as well. Encephalography (not limited to epilepsy, alpha-waves disqualify you just as well). Vision must be near-perfect, and until recently, no LASIKs were allowed (probably still so). Hearing tests (high freq), bicycle cardio load. Of course, complete set of urine and blood tests. IQ, MMPI and other psycho tests.
Russian medical is called VLEK, and can be passed at several locations that are usually at airports. There are 4-5 of these in Moscow. You need several days to pass it, and in period of high load, it can be a couple of weeks (or if additional tests are required).
You may say that all that doesn't make sense, but in fact it does - it is designed to bring pilots from former USSR rather than westerners. These are used to VLEK (some ex-soviet states maintain it as does Russia).