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We see Karkov in Robert Jordan's Gaylord's flashback. After learning some general details about him, we witness a specific conversation between him and Robert Jordan, on a wide variety of subjects – political, literary, and personal.
On the eve of the Republican assault, we meet Karkov in Gaylord's. He doesn't have a good night. "Dolores" has delivered "news" which is totally false, his mistress wants to have a picnic at the supposedly secret assault, and no report has been received from Robert Jordan.
Early in the morning of the next day, he saves Andrés and Gomez's butts from the maniacal Comrade Marty, and promises Marty he's going down.