One policy established by mikhail gorbachev was called glasnost. this can best be described as

Glasnost can be best described and best translated as "openness". It was supposed to be associated with the freedom of speech, where the press and the public could attend court hearings and for the sentence to be read out in public. You could also link glasnost to transparency. It is also particularly attached to reforms of the judicial system, so a sort of extra transparency for the judicial branch of government.

They weaken the south vietnamese army.