Russia: 9-13 rubles per litre, $0.30-0.40. Taxes are around 5%. I mean special benzin tax, not including VAT and other taxes. If you'll include ALL taxes it will rise to maybe 40%.
Edit: Maslo, you from Poland? Last year Poland and Russia made visas mandatory even for Kaliningrad region (Eastern Prussia). Before that many Poles preferred to go to Kaliningrad to fill the tanks...