Police warn that the foreign visitors are 'risking their lives' on world's deepest lake.
Freak climate conditions sees an abnormally warm November.
Seven year old sparked full scale police inquiry but had simply lost track of time as he read good books.
Prime minister raises the issue on sidelines of the Asia-Europe Meeting (ASEM) in Ulaanbaatar.
A pioneering French-Siberian Scientific and Education Centre highlights international recognition of Siberia's scientific strength.