Nikolai Ivanovitch Lobachevski is his name

So arty cineaste folks on my list, I call you to come to my aid.
There was, recently, a film about a young man living in post-Soviet Russia with his bedridden mother. Said mother did not know that the Soviets had fallen, and he was perpetuating that belief... because he didn't want the shock to kill her or something like that. I can't remember the name of the film and Tersa has never heard of such a thing. Anybody remember this film, especially the name?

Also: Anybody know of some Russian-language films to recommend that are out on DVD, especially ones Netflix might have? I've tagged 'Moscow does not allow tears' and 'Letters to Brezhnev' as possiblities.

EDIT: Unrelated but put here so Tersa can see it. Not only is Paris in 'Stir of Echoes' but so is Doctor Cameron, the XX hottie from House.