Group of tourists got stuck at 2,300m after helicopter blades froze.
Mother of 25 year old Colin Madsen flies to Russia as search is underway in Buryatia.
Father missing under snow; more than 200 people continue search and rescue at -23C, snowstorm and bleak light of polar night.
More than eighty rescue workers and a helicopter are involved in the hunt for the boys in sub-zero temperatures.
The Mi-8 with 25 passengers and a crew of three on board crash landed some 45 km into a flight, said early reports.
Rescuers finally reached him after 17 days but there was ‘no miracle’.
Meanwhile, Emergencies' Minister vows better space monitoring of flooding as plans underway to stop a repeat of 2013 crisis.
Strategic bombers redeployed Eastern Military District in snap exercises called by Vladimir Putin.
Honour in Yakutia to Karina Chikitova, who - at the age of 4 - survived 12 days and nights alone in the Siberian wilderness.