In the Russian Arctic, the warming trend has been accompanied by abnormally high temperatures and changes in precipitation that have had a significant impact on various terrestrial environments. In particular, the continuous permafrost zone has been degraded due to the warming and thawing of the permafrost. In response to these changes in the natural environment, joint research projects have been conducted over the last decade in collaboration with local Russian and Siberian researchers. In this presentation, the current understanding of the natural environmental changes in the Russian Arctic and the future direction of the joint research will be introduced.