Following the death of Stalin, new leaders attempted to "de-Stalinize" the Soviet Union causing unrest in the Eastern Bloc and members of the Warsaw Pact.[1] In spite of this there was a calming of international tensions, the evidence of which can be seen in the signing of the Austrian State Treaty reuniting Austria, and the Geneva Accords ending fighting in Indochina. However, this period of good happenings was only partial with an expensive arms race continuing during the period and a less alarming, but very expensive space race occurring between the two superpowers as well. The addition of African countries to the stage of cold war, such as the Democratic Republic of the Congo joining the Soviets, caused even more unrest in the west.[citation needed]