Russia

As of 3 years ago in St. Petersburg, with the exception of caviar, food was still relatively cheap. I couldn't quote a price, though.

"What is the food like in Russia/St Petersburg?" Well, that's a pretty vague question, but I'll try my best. First of all, the cities you listed will have all the international styles found in cities of comparable size. For specifically Russian food, of course, try the delicious borscht. You will encounter a lot of pork, potatos, mushrooms, fish, dill and cream. For drink, wine and beer are readily available, although of varying quality. A unique Russian beverage that you should try is kvas. Imagine dark bread soaked in water for several weeks, then carbonated and sweetened with honey or currants. It tastes better than it sounds and it grows on you after a while.

Be sure to try the Russian ice creamn. It's quite different from our American ice cream. I don't know how to describe the difference, but it's a pleasant surprise and very good. Kvas, which Tom mentioned, is an acquired taste; still it's worth trying. You get it on the streets. Don't drink the water in St. Petersburg. You'll encounter basically a meat-and-potatoes kind of diet--in some ways a Midwestern farmer's kind of diet--expecially in Moscow. It tends to be fairly high in fat and cholesterol. The meat--especially sausages--can be quite fatty. Do have borscht; it's very good (a Russian staple) and is made a variety of ways. There's more seafood (fish) in St. Petersburg. Russian wines, at least the ones I've had, tend to be mediocre. But the wodka (that's how it's pronounced!).... some of the world's best.

I should also add that you'll probably encounter more pickled and smoked food than anywhere else in Europe.