Russia House Restaurant and Lounge
Russia House Restaurant and Lounge, web site, 1800 Connecticut Avenue NW, Washington, DC, near Florida Avenue, 202-234-9433, closed Sunday (Metro Trip Planner - opens in new window) [WaPo | City Paper | openlist | Yelp]
Some claim it is excellent, I need to check it out. I love good Russian food, despite its unavailability in Russia. The best places I know are in Helsinki.