Interesting, as I knew a number of Tanzanians when I worked there who had trained in East Germany, Romania and the USSR. Our Chief Mechanical Engineer had trained in the DDR to a strangely low standard but on return to Tz had enrolled on some sort of course with an American university and was highly valued (despite looking, walking and sometimes behaving like a crippled chimpanzee, he was genuinely excellent in his department and bought his round with the best of them afterwards). He told a similar story to those in the first half of the film above (got bored, sorry) of being seriously and actively disliked by the locals, and having to lock himself in his room for most of his stay.
The Maasai doctor who kept me breathing for a few days had trained to a MD level in Moscow, and who, in addition to Maasai and KiSwahili, could speak perfect English, Russian and German, which is above my pay grade in any rating. He told the same story about Moscow's dislike of blacks, and had the scars as a souvenir. My company's Nurse was trained in Romania, but he was a useless twat who deserved everything he got there.
I've no idea why the Sovs and their underlings thought that all this MultiCulturism would benefit international relations; none of those I spoke with had any truck with them at all.
They were kept in what looked like old barracks and rarely socialised with the locals. I never got the chance to speak to any of them because the Stasi took exception to our presence.