This isn't all that surprising, the Lingua Franca for electronics and software development in Eastern Germany was also English, not Russian (or rather a mix of German and English, with much more German than the "Denglish" that is used today, but for terms that didn't already have an established German word, the English word was used, and I guess it was much the same in the Soviet Union).
If you browse through East German vintage computer manuals, there's a lot of English used for "special terms" like "BREAK", "HOME", "ESCAPE" etc.