My immediate thought was that in all these instances, the foreign capitalists intervened and provided material and financial support for anti-government protests and opposition. This caused huge unrest throughout the country.
In my view, and I admit I am not fully fluent with these particular countries, (but would research if you claim me to be incorrect), the governments of all these countries you mentioned needed to implement martial law in order to confront foreign instigators.
Chevron caused a lot of havoc in Burma or Mayanmar. And the U.S. backed NGO's as well.
According to B. Raman, the former director of India's foreign intelligence agency, RAW, in a December 2001 paper published by his institute entitled, "The USA's National Endowment For Democracy (NED): An Update," Helvey "was an officer of the Defence Intelligence Agency of the Pentagon, who had served in Vietnam and, subsequently, as the US Defence Attache in Yangon, Myanmar (1983 to 85), during which he clandestinely organised the Myanmarese students to work behind Aung San Suu Kyi and in collaboration with Bo Mya's Karen insurgent group. . . . He also trained in Hong Kong the student leaders from Beijing in mass demonstration techniques which they were to subsequently use in the Tiananmen Square incident of June 1989" and "is now believed to be acting as an adviser to the Falun Gong, the religious sect of China, in similar civil disobedience techniques."
Cuba and Vietnam is the same story.
Calm