Realistically, probably just what it looks like. Guy is a decent human being, repeatedly tries to warn boeing of safety issues, gets ignored over and over, plane kills a bunch of people, guy kills himself because he feels responsible and those deaths weigh on his mind.
We don't know it was self inflicted, and I'd argue its still murder either way, but until more details are released there's no need to put his family through even more grief by spinning out conspiracy theories around his death.
Oh! I thought this was that story about the pilot getting blamed the first time one of their planes nose dived into the ocean. Or was that a different company?
I know boing is an airplane company who causes accident and kills people by being too much of a cheapskeat . But who is The kremlin and what did they do ? (I geniunly don't know)