Roughly how much would it cost to go to Russia for two weeks (from the U.S.)?

Answer 1

Will you stay in one city (Moscow or St. Petersburg) or travel inside Russia as well?

Let's be optimistic:
Airfare from the U.S. to a major city (Moscow or St. Petersburg) - $ 700 (if you're lucky, can easily be about $1,000, for good deals check www.kayak.com). If you're coming from Europe, it can be much cheaper

Hotels - $ 50/night minimum (in Moscow I would put $120 to be more realistic)
Food - $ 20 - 50 per day .
Local travel - depends where you go. So can be anything between $ 100 to $ 700.
Souvenirs, drinks etc. - another $ 250 (again, on the low side)

Although you can do it under 2,000, more realistically we're talking about $2,500 - $3,000. Wow, quite expensive.

Unless, of course, you buy a tour (they have negotiated tariffs).

Answer 2

Depends on your needs.
Hotels are very broad in range

But in general approx $2,000 at a min