 Despite having joined the UCC, the Soviet Union continued its policy of bilateral agreements.New treaties with the German Democratic Republic (effective November 21, 1973), Poland (October 4, 1974), and Czechoslovakia (March 18, 1975) were concluded.The 1967 treaty with Hungary had already been prolonged in 1971 and was again renewed in 1977, the treaty with Bulgaria was renewed in 1975.