Marko Ramius is a fictional character from the novel "The Hunt for Red October," written by Tom Clancy. He is a Soviet submarine captain who seeks to defect to the United States with his crew and a cutting-edge submarine, the Red October. Ramius is portrayed as a skilled and intelligent leader, navigating the complexities of Cold War tensions. In the story, Ramius's motivations are driven by his disillusionment with the Soviet regime and a desire for freedom. His character is central to the plot, as both the U.S. and Soviet forces pursue him, leading to a tense and thrilling naval chase.