Hot ash tumbled down the mountain's southeastern slope as Bezymianny showed its power.
An ash column reached 7 kilometres above sea level on Wednesday morning.
City of 180,000 is just 26 km from ‘waking’ Avachinsky on Pacific’s ring of fire.
Klyuchevskaya Sopka's crater fills with lava amid new volcanic activity.
Russian photographer writes about a volcanic eruption at Tolbachik, seen by the Soviets as the most lunar place on the planet.
Gas bubbles from waters filling crater hole on Yamal peninsula two months after volcanic-style explosion in thawing permafrost.
Emergency chiefs say that increased activity means tour companies and residents must avoid going too close to eruptions.
Soul-stirring images of eruption on the Klyuchevskaya Sopka caught by extreme travellers at altitude of 2,850 metres (9,350 ft).