A file of correspondence and reports concerning political relations between Bulgaria and the Soviet Union. The documents cover visits to the Soviet Union by the Bulgarian leader, Todor Zhivkov, for meetings with the Soviet leader, Leonid Brezhnev, and to open an exhibition celebrating Bulgarian economic achievements; and visits to Bulgaria by notable Soviet politicians, including the politburo member Andrei Kirilenko. Other documents in the file cover Soviet press reports on Bulgaria's economic development; and Bulgarian press reports on trials of Soviet dissidents, and on Soviet relations with China and the United States.