The 7,000 year old volcano is the highest mountain in Russia outside the Caucases.
Visitors ‘risking their lives’ to witness spectacular formation of second cone on Klyuchevskaya Sopka in Kamchatka.
Soul-stirring images of eruption on the Klyuchevskaya Sopka caught by extreme travellers at altitude of 2,850 metres (9,350 ft).
Klyuchevskaya Sopka's crater fills with lava amid new volcanic activity.