It feels like an intelligence shakedown. Nginx has a rather large install base. FSB would love to have an entry point in it I'm sure, or maybe they previously had one and are trying to gain it back?
[1] - https://www.f5.com/company/news/press-releases/f5-completes-...
Clandestine ops have an extremely low probability of success using this strategy and nobody who does them is this incompetent. Especially not Russia.
(yeah, i know there's a pro version of nginx. never used it)