On June 29, 1978, Vietnam officially joined the Intergovernmental Organization. On June 29, 1978, Vietnam officially joined the Intergovernmental Organization. On June 29, 1978, Vietnam officially joined the Intergovernmental Organization. On June 29, 1978, Vietnam joined the Intergovernmental Organization. On June 29, 1978, Vietnam joined the Intergovernmental Organization. On June 29, 1978, Vietnam joined the Intergovernmental Organization. On June 29, 1978, Vietnam joined the Intergovernmental Organization. On June 29, 1978, Vietnam joined the Intergovernmental Organization. On June 29, 1978, Vietnam joined the Intergovernmental Organization. On November 29, the Soviet Union joined the Intergovernmental Organization. On August 5, the Soviet Union began to increase the number of missiles in various shipments to the