Why did Vietnam join the Warsaw Pact?

Vietnam has not joined the Warsaw Treaty Organization.

In the mid-1950s, Vietnam just fled France and ushered in the South Vietnamese regime supported by the United States and the United States. It was not until the 1970s that Vietnam ended its state of war.

1955, 14 In May, the Soviet Union, Czechoslovakia, Bulgaria, Hungary, GDR, Poland, Romania and Albania signed the Treaty of Friendship, Mutual Assistance and Cooperation in Warsaw in response to the decision of the United States, Britain and France to admit the Federal Republic of Germany to NATO. In June of the same year, the treaty came into effect, and a military and political alliance, the Warsaw Treaty Organization, was formally established. Headquartered in Moscow.