Mystery over circumstances of crash when chopper was on 'unsactioned' flight.
Agreement means Power of Siberia pipe could be delayed, it is claimed.
More than 20 calves born although park keepers say there could be more.
Gas bubbles from waters filling crater hole on Yamal peninsula two months after volcanic-style explosion in thawing permafrost.
Altai route for gas to China could take priority, reported Reuters.
‘Thousands’ perish amid calls for a state of emergency in the region, with fears anthrax vaccine is a cause of death.
Fire eliminated at Urengoyskoye field after three and half hour battle.
More than 20 new deals on energy, investment and education are inked in Beijing.
Cops in the far north of Siberia 'to be issued with reindeer instead of police cars'.