(You want to search for "Arctic Council" on this kinda stuff).
In the good old days in April 2022... War on the Rocks had this to say:
Despite these Arctic project collaborations, Moscow views China’s growing presence in the Arctic with distrust. With vast territory and a more-than-20,000-mile coastline in the Arctic circle, Russia has a strong interest in preventing external powers from influencing Arctic affairs, and thus sees China’s claim to “near-Arctic state” status and advocacy for non-Arctic states to have a greater say in Arctic affairs as an unwelcome push for “internationalization” of the region. Tensions between the two nations surface at times. In 2012, for instance, Russia blocked Chinese research vessels from conducting surveys along the Northern Sea Route during China’s fifth Arctic expedition. Up to 2013, Moscow persistently opposed granting China observer status on the Arctic Council. Even after the 2014 Crimea crisis, when Russia began to demonstrate a warmer posture toward China’s role in the Arctic, Moscow’s suspicions remained in place. In 2020, Russia arrested the head of the Arctic Civic Academy of Sciences in St. Petersburg on the charge of passing classified information to China. Beijing clearly knows Russian distrust.
But there seems be a thaw of sorts, April 2023 China-Russia Arctic Cooperation in the Context of a Divided Arctic | The Arctic Institute – Center for Circumpolar Security Studies is more circumspect about this rivalry.
(Keep in mind that Russia is more or less suspended from the Arctic Council since June 2022)
It starts out with reminding essentially of the history of caution Russia has:
Although the active support and strategic leadership of the leaders of China and Russia have provided the basis for effective Arctic cooperation between the two countries.9) In fact, for a long time, the Russian local level has always been wary of foreign forces developing the Arctic region, worrying that the entry of foreign companies will affect the dominance of domestic companies, damage the ecological environment, and threaten regional security.
But then goes on to talk of budding bromance:
The impact of Russia’s war in Ukraine has spread to the Arctic region. The Arctic 7 have refused to collaborate with Russia, and the Arctic is forming a confrontation between Arctic 7 and Russia. In order to break through this predicament, Russia, which has been squeezed out by other Arctic countries, has to look to China for its Arctic cooperation. For China, Russia’s enthusiasm for Arctic cooperation is certainly a good opportunity, but China also needs to be vigilant that the deepening of its Arctic cooperation with Russia will not affect its relations with other Arctic countries. At the same time, from the perspective of long-term interests, China’s future Arctic development cannot be separated from the Arctic Council, and actively promoting the normal operation of the Arctic Council is necessary and important for China.
Keep in mind, global warming has been causing Arctic interest to heat up for a while (due to the potential for future ice-free access):
Russia planted a flag by sub on the North Pole and claims some continental shelf.
USA has some kind of free-navigation-between-Canadian-islands spat going on with Canada.
There is some kinda squabble between Denmark and Canada re. an island between Greenland and continent (though it might have made the news because it was resolved ?).