"Not a single anti-aircraft missile system from the Russian Federation has ever crossed the Russia-Ukraine border," the defence ministry said in a statement carried by local news agencies.

The ministry accused Ukraine of being behind the disaster in which 298 people died, saying it had presented evidence that "showed the involvement of Ukrainian units using (Soviet-designed) BUK missiles".

Earlier in the day, a Netherlands-led joint investigation team said -- for the first time -- that the missile which brought down the plane over eastern Ukraine came from a Russian military brigade.

The group "has come to the conclusion that the BUK-TELAR that shot down MH17 came from 53rd Anti-aircraft Missile Brigade based in Kursk in Russia," top Dutch investigator Wilbert Paulissen said.

He told reporters gathered for a press conference that "the 53rd Brigade forms part of the Russian armed forces."

The Malaysian Airlines Boeing 777 was blown out of the sky over conflict-torn eastern Ukraine on July 17, 2014 while en route from Amsterdam to Kuala Lumpur.

Ukraine and its Western allies have long accused Russia of funnelling troops and arms across the border to fan the flames of the conflict.

Moscow has denied the allegations despite overwhelming evidence that it has been involved in the fighting and its explicit political support for the rebels.

Investigators had previously concluded that the plane was hit by a Russian-made BUK missile system brought in from Russia and fired from territory in Ukraine held by Moscow-backed rebels. But they had stopped short of directly saying who pulled the trigger.

Now the team has painstakingly recreated the route taken by the missile convoy from Kursk towards the border into Ukraine using videos and photos.