Secret missile tests were executed in Finland by the investigation team, the Netherlands largest newspaper Telegraaf reports at September 27. The tests were likely done in Finland because this country once operated BUK systems. It is one of the few reliable, neutral states worldwide which has knowledge of BUK and operated these systems. Sources near the criminal investigation reported to the Telegraaf.
In July 2016 Ukraine executed missile tests as reported here.
Later on September 27 the Finnish KRP (National Bureau of Investigation) confirmed via Twitter it has provided assistance to the Netherlands on MH17, but it did not comment on details. Also chairman of the Finnish commision for foreign affairs confirmed Finland helped the Dutch investigators.
JIT did several tests with different type of missiles. From the results of those tests is was irrefutable concluded that a Russian version of the BUK missile was used to shot down MH17. And not an Ukraine version of the BUK missile.
There will be not an announcement on the law and court the perpetrators will be prosecuted. Ministers of the JIT countries meet several times to discuss the court but so far nothing has been made public.
Only at the end of the criminal investigation it will be made public under which law and court the prosecution will be done. A source with knowledge told Telegraaf everything has been arranged in detail. As soon as a perpetrator is known the court can be made ready very quickly. Countries only need to decide on the number of seats for judges and have to agree on the financials. This court case will cost a lot of money.
The reason the JIT countries wait deciding for using an international tribunal or a national court is because it depends on the perpetrators. For one kind of perpetrator international law is better because it makes extradiction more easy. With a group of perpetrators an international tribunal is better. “Fact is we cannot make errors” according the source.