Ukraine president Poroshenko said at an EU meeting in Brussels some remarkable things. He made a link between the MH17 investigation and the hesitation of the Netherlands in not signing the Ukraine–European Union Association Agreement.
These are the words of Poroshenko at October 20 2016. The interview in which these words were said can be seen here. At 1 minute 6 seconds in the video Poroshenko appears.
“We are having a very effective cooperation with the Dutch nation starting with the investigation in MH17 disaster and terrorist attack. It was mine decision when I trust the Dutch investigation to give them the leading role because they suffered the most. In that case I think that it would be a very dangerous precedent if ratification is not happening”.
In short, Poroshenko wanted “something for something ” or Quid pro Quo.
The next day Dutch PM Rutte stated “it is not wise to link the MH17 investigation to the ratification of the Ukraine-EU treaty”. Dutch newspaper De Telegraaf reported about the response of Rutte here.