What caused the Soviet Union to get involved in countries as diverse as Egypt, the Congo and Vietnam?

There were statements of the Soviet Union were involved in Vietnam's war deeper than commonly thought. War was organized by communists (agents of Moscow). The dead were about 3 million. Actually, Moscow and Communists Beijing were fighting with the US. Because Vietnam was extremely important strategical district for both these countries.

Explanation:

hernan cortes;

explanation:

the authority to tax.