Who gave the order?
But the relatives of those who died want to know who can be held responsible.
"Apart from wanting to know exactly what weapon was used and where it was fired from, we also want an answer as to where we go from here," said Evert van Zijtveld, who lost his 18-year-old son Robert-Jan and daughter Frederique, 19, in the tragedy.
"We want to see the perpetrators caught and put on trial," he told the AFP news agency.
JIT prosecutors have established the identities of about 100 people "linked to the crash or the transport of the Buk" missile, but they are yet to determine who could be held criminally responsible.
They say they will need to establish who gave the order to move the missile launcher into eastern Ukraine, and where the order for it to be fired came from.
Тобто саме головне залишилось вияснити ХТО ДАВ КОМАНДУ НА ЗБИТТЯ МН-17
І тут же цікаве добавлення - як кацапія на протязі двох років змінювала свій "базар"
Russia's changing story
In the two years since MH17 was shot down, Russian officials have presented several theories about what happened.
21 July 2014: Four days after the tragedy, Russia's defence ministry presented satellite photos and other images suggesting it was downed by a Ukrainian surface-to-air Buk missile or a Ukrainian military jet
June 2015: Russia's Investigations Committee named a "key witness" - a Ukrainian "aircraft ordnance technician" - who claimed that the Boeing was downed by a Ukrainian Su-25 fighter
October 2015: Buk missile producer Almaz-Antey said that the plane was indeed downed by a Buk, but an old one - which Russia no longer had in its arsenal
September 2016: Russia's defence ministry released what it said were radar data suggesting MH17 was shot down by a missile, but not one fired by Russian-backed rebels