New rail bridge linking the two countries symbolizes closest-ever economic co-operation between neighbors.
Analysts say opening of LNG facility in Queensland with exports to China could affect Yamal as Pacific countries look to take on Russia in Asia.
The Russian president pledges to open up exports of liquefied natural gas to meet Far East demand.
Agreement means Power of Siberia pipe could be delayed, it is claimed.
Construction launched on 3,968 kilometre 'Power of Siberia' gas pipeline.
Pipes are built over bulging and unstable Arctic pingos prone to violent eruptions caused by 'thawing methane gas', as seen twice on the Yamal peninsula this year.
Up to 300,000 people a year expected to pass through Sabetta International as region gears up to become a gas powerhouse.
Subsidence from old coal mine a possible cause of latest mystery hole.
Pro-Vladimir Putin demos one year on from the Kiev uprising.