This has been in several news outlets over the past few weeks. A Russian Government Strategy Paper outlines an Arctic Force to protect Russia’s claim in the regions. I found an more in depth review of the plans on the Jamestown Foundation’s web page.
Furthermore, Norway is in the process of legislating a formal claim to an area close to the North Pole based on the revised Law of the Sea Treaty.
These political signals could be early indicators for the more tension loaded scenarios.