The international criminal enquiry presented its findings into the crash of Malaysia Airlines Flight MH17 in conflict-torn eastern Ukraine in July 2014, which killed all 298 people on board.
"The Joint Investigation Team has concluded that MH17 was downed by a Russian-made missile and it was fired from rebel controlled territory," national news agency Bernama reported Prime Minister Najib Razak as saying.
"Based on the two findings, Malaysia wants firm action to be taken. We have promised that those who were responsible for the downing of the aircraft will be brought to justice," he told Malaysian media during a trip to Germany.
"We owe it to the families. The families want justice. So we will pursue this," he said.
The report did not assign blame but said the Boeing 777 was shot down by a BUK missile system from an area in eastern Ukraine controlled by pro-Russian separatists, and that the system was brought in from Russia and then taken back there.
The dead included 44 Malaysians, along with 192 Dutch nationals and 27 Australians.
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