Permafrost over much of Siberia is a major impediment to development; volcanic exercise in the Kuril Islands; volcanoes and earthquakes around the Kamchatka Peninsula; spring floods and summer time/autumn forest fires all over Siberia and aspects of European Russia that the event from the East Slavs passed by way of https://griffins4jih.blogoscience.com/36938973/examine-this-report-on-russia