New video has emerged reportedly showing Russian-backed rebels at the scene of the MH17 crash one year ago in eastern Ukraine after they realised they had shot down a commercial airliner.

The video - obtained by News Corp Australia - appears to show the Ukrainian insurgents arriving at the site after believing they had had shot down a government fighter jet.

Foreign Minister Julie Bishop told The TODAY Show the footage was "sickening to watch".

"And 12 months on from the downing of MH17, it's deeply concerning this footage has emerged now," she said.

She said while she could not confirm the authenticity of the video, it was "certainly consistent" with previous intelligence received by Australia regarding the culpability of Russian-backed rebels in the disaster.

A final report into the incident due in October is likely to attribute responsibility over the crime.

Armed rebel soldiers patrol at the main crash site of the Boeing 777 Malaysia Airlines flight MH17. (AAP) (AAP)

Ms Bishop said the vital next step was persuading the UN Security Council to establish an international criminal tribunal to bring those responsible to justice.

"We are determined to hold those responsible accountable, we are determined to see this through," she said.

However, she admitted it would not be easy to get all members of the council - which includes Russia as a permanent member - to agree.

A Malaysian expert checks debris at the main crash site of flight MH17, which crashed flying over the eastern Ukraine region, near Grabovo, some 100 km east from Donetsk. Picture: AAP (AAP)

Russian President Vladimir Putin has dismissed calls for a tribunal to be established, saying it would be counterproductive.

The chilling video is likely to form a key part of the ongoing investigation headed by the Dutch Safety Bureau.

The footage also seems to shows the rebels rifling through the luggage of passengers and crew.

Ukrainian government alleges video shows weapon used to bring down MH17. (supplied) (Supplied)

Dialogue from the video reportedly indicates the militants of the so-called Donetsk People's Republic originally still believed the field of wreckage was from a Sukhoi fighter jet.

"This is the plane, I think," one says.

"Yes, it’s the Sukhoi."

A Ukrainian Sukhoi SU-25 fighter jet had been shot down the day before.

Armed pro-Russian rebel soldiers guard the MH17 crash site in Ukraine. (AAP) (AAP)

However, the number of backpacks, money and the amount of wreckage soon sparks a realisation among the militants.

"There it is, it is the passenger plane," one man says.

The militants then contact a rebel base for clarification.

Search and rescue specialists inspect at the crash area of Malaysia Airlines Boeing 777, which was carrying 295 people and flying from Amsterdam to Kuala Lumpur. (All images Getty) (Getty)

"It’s a civilian, it’s some civilian," one fighter says.

Russian-backed separatist leaders have previously claimed they had not shot down MH17, killing all 298 people on board including 38 Australians.

However, speculation has been rife in the West the Ukrainian rebels are to blame, having hit the plane with a shot from a BUK missile launcher supplied by the Russian military.