All public events cancelled, extra protection for children as they go to kindergarten and school.
Hi-tech project would use computer models to predict climate change and help with safe production of oil and gas in Northern Russia.
Rescuers vow to find helicopter that vanished in strong winds on 10 October.
Whisky proves popular in the land of vodka.
Emergency services received calls from worried residents concerned that doomsday had arrived.
Sukhoi Superjet-100 landing gear supports broke on icy ground after the stop.
Retired teacher Angela Vorobyova braves monsoons and dances a tango to reach peak - and honour an 80 year old promise.
A man is facing prosecution after posting gruesome images posing with his trophy animals on the Internet.