Hope for future of the rare species as census says there could be as many as 540 of them now living in the Far East.
Possible route could see 400km/hour bullet train pass through heart of Siberia and Altai region with stops in major cities.
Sensational pictures of last week's meteorite strike have emerged from a Russian photographer.
A theme of modernisation was behind the prime minister's swing through Siberia this week.
Startling new details emerge of the most mysterious of Siberia's newly created giant permafrost holes.
Geysers, active volcanoes, thermal lakes, mountains, Pleistocene glaciers, cascading rivers... and a lot of bears!
Winter show time as birds flock to unique ice-free Altai waters.
Local reindeer herder witnessed the tundra explosion that led to birth of new hole in river.
Deep below the earth, we spend three days with the men and women working at the frontline to keep Russia, and the world, fuelled.