Dr. Dimitri Moisevitch, a tall, blonde man, is one of Dr. Heywood Floyd’s closest friends. Due to Dimitri’s work in the U.S.S.R. Academy of Science, Floyd, an American, is unable to share details pertaining to TMA-1 with him. This underscores the tension between science and politics in the novel; on one hand they are intimate friends, on the other, potential adversaries.