They're all Russian citizens, Mary, although they might be of varying ethnicities (ie tatar, ukrainian, bashkirian etc).
For example, I was doing a Masterclass (on "Stagecraft in Opera") in Krasnodar with students of the Conservatoire there (The Krasnodar Philharmonia, of which the Conservatoire is a "department", is a magnificent former Palace built in the 1820s) as part of our "outreach" programme for a Music Festival we had toured down there (muchos gracias as ever to the British Council for funding work in the further-flung provinces of Russia). The students were on different levels, so we worked with them at the level they were at. A youngish tenor sang a rather nice performance of "I attempt from love's sickness to fly in vain", and he had clearly done his homework - he could give me a fairly accurate line-by-line translation of what he was singing. However, an exceptionally good lyrico-spinto soprano (obviously their star pupil and they saved her until the end) did the first aria in "Manon Lescaut"... but couldn't tell me who Manon was, or what was happening, where the scene was set... or really anything at all
She seemed to approach the whole thing as a huge
vocalise, and was rather upset that I wanted her to walk around, strut about, etc - and was highly offended when I suggested that Manon was really a scarlet harlot? (Even worse, the Head Of Vocal Faculty took me aside afterwards and complained that I had said this! And I'd used the most delicate euphemism in Russian, too.) I could sense the antagonism when I was getting her to pout and preen. A coloratura sang "Caro nome", and the same story there... she was also singing from a "single sheet" of the aria, and it cut-off at the end before Marullo's men appear and sing off-stage. (Blimey, it was lucky in retrospect that we didn't go into any detail of what happens to her after being delivered to the Duke Of Mantua...)
The Dean Of Studies brought the whole thing to a close with some kind of coyly tactful remark that "opera production in Britain obviously differs from our great Russian traditions". Ho-hum...
The funniest irony is that "Miss Manon Lescaut" (who was very beautiful and would be ideal casting for the role) had her "claque" of followers in the audience (it was an open masterclass) and as soon as they were freed, they gathered around her in deep sympathy, whilst she pouted and preened and behaved like exactly the kind of spoilt diva I'd wanted from her in the scene ;-)