Here is a video from the defected KGB agent Yuri Bezmenov:
The following is the part of the interview I am intersted in:
... Most of the Awami League party members, Awami-leagueians, People's Party, were trained in Moscow in the high party school. Most of the Mukti Fauj leaders Mukti Fauj in Bengali means People's Army, same as Swapo and all kinds of liberation armies all over the world the same bunch of useful idiots. They were trained at Lumumba University and various centers of the KGB in Simferopol, in Crimea, and in Tashkent. So when I saw that Indian territory is being used as a jumping board to destroy East Pakistan, I saw myself thousands of so called students traveling through India to East Pakistan, through the territory of India and Indian government pretended not to see what was going on. ...
Did USSR train East Pakistani separatists?
If so, can you supply me with a source?