@ WideScreen"
Not to say, the JIT has investigated this whole and never did come up, that additional info was available for Ukraine or the airlines, that the airspace above FL250/320 would be unsafe. Given the "unsafe airspace" is one of Russians defenses, it can be expected, the JIT did focus on this subject. The general no-nonsense, no cover-up approach Dutch people tend to have, makes it also not likely, information around this subject is kept secret.
The delacartion of Frank Brenner ,DG of Eurocontrol at the time to either the IT or to a commission of the Dutch paliament ,( I cannot recall which one ) as to what Network Manager knew , and when and to who it was passed on to ( the Dutch State represenative and not KLM , if my memory is correct, ) gives a clue.
I will PM you another clue.