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www.waytorussia.net
"The following items are subject to declaration and limited entry to Russia. These items (or excess) should be declared and you should pass through the "red corridor". Some of the items that are being brought to Russia permanently, for sale or commercial use, may incur customs tax, which can go up to 30% of the total price (that is usually determined by the customs officials).
• Cash foreign currencies (if equivalent or more than $3000 US) or rubles (if more than 500 minimum salaries, equals approximately 75,000 RUR which is approximately $2500 at today's rate),
• Stocks and securities, including travelers cheques
• Alchohol (if more than 2 liters),
• Cigarettes (if more than 100), tabacco (if more than 250 gramm), cigars(in more than 50),
• Caviar (if more than 250 gramm), sturgeon(if more than 250 gm),
• Items for commercial activity (including advertising materials)
If you have less than the allowed amount of the items listed above (e.g. $2000 US in currency, 100 gm of caviar, 1 bottle of vodka etc.), then you do not need to declare it when you come / leave Russia and you don't have to pay extra money to be able to bring it through. Just go through the "green corridor".
You can still bring in between $3000 and $10000 (or equivalent), but if you have more than $3000, you need to declare it, so when you leave the country you can prove you're not taking the money out of Russia.
Also, recently travelers cheques were made subject to declaration, so if you want to avoid going through the red corridor, bring your money on credit cards instead."