In an open letter Wednesday, relatives say, "For us, as concerned families, it is very important that the perpetrators will face justice."
Flight MH17, from Amsterdam to Kuala Lumpur, was hit by a Soviet-era Buk surface-to-air missile on July 17, 2014, above conflict-torn Ukraine. All 298 passengers and crew onboard were killed.
A spokesman for the investigation declined to comment on progress in the probe.
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