RUSSIAN ASSIGNMENT (568 pp.)Leslie C. StevensAtlantic-Little, Brown ($5.75).
In a bar on Pushkin Square, Rear Admiral Leslie C. Stevens, U.S. naval attache in Moscow, sat over a mug of strong, sweet Russian beer. Before very long he was joined by "a little black-browed man with no collar and a very dirty shirt." His companion turned out to be a typesetter on Pravda, who, after assuring himself that Stevens was not an MVD agent, whispered: "Don't worry about propaganda against your country. We Russians do not believe it. Whenever you read such things, it is a sure sign the Russian people . ....