Kyiv believes Malaysia Airlines flight MH17 was shot down by pro-Russian separatists armed with a surface-to-air missile launcher, something that Moscow has repeatedly denied.
Ukraine’s foreign minister said that bringing highly sophisticated, weapons into Donbass should be treated as a war crime.
Pavlo Klimkin said: “We will find other ways, both in the sense of getting physical persons of bringing them to justice and in the sense of clearly proven, that Russia is a state sponsor of terrorism.”
The Dutch Safety Board, which under international air crash investigation rules is not allowed apportion blame, said that Ukraine should have closed the international air space over the conflict zone.
Kyiv has defended its decision to keep the airspace open, saying it was unaware that planes flying over the area were under threat from Buk-style anti-aircraft weapons.