I was trying to imagine why
anyone, let alone a Russian with "easy come, easy go billions" would want to buy a B-52 for $500m (unless it came with a few nuclear bombs) for which a middle-eastern "caviar producer" might pay far more...
Nah, if I were one of those immoral newly-capitalist Russkies, I'd consider paying $100m for a SR-71 Blackbird maybe. Or a little more for a Concorde still in flying condition, I guess.
OK, so the B-52 has 8 engines, and in our days of oceanic commercial services that operate on just twin-engined aircraft, the other 6 engines could represent a safety bonus. Unless you can already afford an executive Airbus A-380 which on balance (not requiring a military crew for maintenance and in-flight refuelling services) would make your billions stretch further.
The repercussions of the US sub-prime market have yet to completely unwind. The Russkies should display some reserve and caution...