Australian political leaders have united in urging Russian Prime Minister Vladimir Putin to explain Russia’s role in the tragedy that saw Flight MH17 being shot down over Ukrainian airspace.

According to a report web portal news.com.au, Labor Leader Bill Shorten announced the country's Opposition will support the request to have Putin barred from attending the upcoming G20 meeting in Queensland.

Queensland Premier Campbell Newman added that Putin will not be welcomed to the state if he did not fully cooperate.

Australia is putting pressure on Putin not only because pro-Russian rebels are being blamed for shooting down the aircraft but also due to the appalling conditions at the crash site.

Another news.au.net report disclosed that investigating officers have been frustrated by the actions of Russian rebels that have besieged the crash site for security reasons.

Russia, however, denied that it has control over the rebels.

news.au.net also said that news reports have surfaced, saying that several bodies had been taken to a hospital in Russia but could not verify whether autopsies had been performed.

Flight MH17, carrying 298 people - 283 passengers and 15 crew - was flying from Amsterdam to Kuala Lumpur when it went down in Ukraine. 43 passengers including the 15 crew members and two infants were Malaysians.

Ukrainian authorities believe that the Boeing 777 was shot down.

MH17 had left Amsterdam at 12.15 pm (Netherlands time) Thursday and was scheduled to arrive in Kuala Lumpur at 6.10 am (Malaysian time) Friday.