Slippery conspiracy. Not worth discussing because the relevant people will of course look into everything in careful reviews of failure, more for learning than looking for saboteurs. No one here will know and it'll just welcome lot's of rubbish speculation and theories.
The chance for failure of a new platform has always been high in the USSR, Russia, USA too. But these new launch platforms in recent months have all been failing at least partially in later stages. This is disappointing. I'm sure this month's Mars mission will also be a failure. Mars missions around the world have around a 50% failure rate and China is attempting the most difficult combination - orbiter, lander, and rover in one single project and all on its first attempt. The Chinese Mars orbiter that blew up on the Russian rocket doesn't quite count since it was not exactly in control on the situation but I give this current mission lower than 50% chance of success. Still you gotta start somewhere and have everything there to fail and learn from why they failed. Maybe a second attempt will have better chances and progressively better.
Asking because the CIA has a history of selling rigged software and computer chips to the Soviets.
Soviets didn’t even know even after they experienced a series of accidents in their gas pipelines and other scientific projects.