WASHINGTON (AP) _ Two weeks ago, Kevin A. Smith was in the library poring over Russian history and recipes. Now he's in a restaurant kitchen preparing blue-plate specials, Soviet-style.

Smith is a chef at the Hard Rock Cafe, one of many Washington establishments looking for a way to capitalize on the U.S.-Soviet summit. The cafe kicked off a special ''Glasnost Week'' on Monday and sold out of Hard Rock summit T-shirts the same day. The festivities continued Tuesday with a performance by Soviet musicians and a children's choir.

Throughout the week, Hard Rock is featuring its own menu translated into Russian and rubles, along with Smith's daily Soviet creations.

Thursday's Russian special was chicken and dumplings, swordfish with green sauce and ground chocolate cake. On Friday the curious can order beef stroganoff, freshwater fish soup, broiled trout and coffee cream roll.

The regular menu, with dishes such as Bordertown guacamole, veggie sandwiches, chiliburgers and root beer floats, was translated for the occasion into a strange mixture of literal and phonetic Russian.

''This is the best compromise,'' said translator Rudy D'Alessandro. ''Titles transliterated into Cyrillic letters, explanations in Russian for the people ordering - because you can look at a 'pig sandwich' and say what is this thing, then you read the explanation and say, 'it's edible.'''

The restaurant, which already has branches in a number of countries, says it is planning one in Moscow.

----

Elsewhere, Benetton, the preppie clothing company, ran a full-page ad Thursday in The Washington Post - a photograph of two children with six Soviet and American flags in their hair and on their cheeks. The full text says ''United Colors of Benetton,'' the firm's current advertising theme.

The day before, Smirnoff vodka took up a full Post page. The ad featured a large red ''X'' through groups of tanks, missiles, soldiers, helicopters, submarines and the like. There was no red ''X'' through three rows of Smirnoff bottles.

''Now that's what we call a successful summit,'' said the ad. ''First the Russians welcomed Smirnoff back in the U.S.S.R. after 73 years. Next, who knows? With a start like that, anything is possible.''

''Certainly we are by no means making a political statement,'' said company spokeswoman Vivian Brooks.

---

The Ritz-Carlton hotel says dove-shaped peace cookies are replacing mints on its guests' pillows during summit week. They are accompanied by a card quoting President Bush on his expectations for the summit.

Not the biggest news, but it did give the Ritz-Carlton a chance to remind journalists that it is a four-star hotel, what celebrities have stayed there and that it had been featured on ''Lifestyles of the Rich and Famous.''

Those dove cookies are going to be served at ''the famous Jockey Club, home of power dining in the nation's capital.''