Reportedly three other countries have made a secret agreement giving Ukraine a veto over publishing results of the investigation of the destruction of flight MH17.

This article belongs to a body of writing that claims that MH17 was shut down intentionally by Ukraine. That is an extraordinary claim that requires extraordinary proof — it is much more plausible that badly trained missile operators were mistaken about the target. The articles I have seen are not extraordinary proof: for the most part, the evidence is attributed to people I can't find much information about, and I am not convinced it is for real.

For instance, this article says that the unusual flight path of MH17 has never been explained, but I recall reading that it (as well as other flights before and after) were diverted away from a storm.

Nonetheless, the author personally attests to getting a runaround in requests for information about this agreement, and I think that point is credible.