

Maybe. There’s no guarantee that every European nation would be on board with sanctioning the US in this scenario.
The Netherlands (where I believe they have the only manufacturing base of the machines that make advanced chips) might decide that it’s not in their best interest to cut the US off.
Anyways I hope this Greenland shenanigans dies on the vine and my silly scenario never comes to pass.
@LilaOrchideen@feddit.org already mentioned rare-earth’s, but Siberia is also extremely rich in non-rare minerals and metals. China would also stand to gain oil, gas, and coal deposits. However one probably overlooked resource is fresh water.
Water is already a massive issue in the northern half of China (not just the arid west, but even around Beijing). Eastern Russia has a lot of fresh water, like for instance Lake Baikal which contains 20% of the planet’s unfrozen freshwater. I saw some talk (5+ years ago) about China wanting to buy water-rights to this lake and pipeline it through Mongolia, but I’ve not heard of there being any concrete plans in the works yet.
Another possible gain would be easier access to the pacific and the arctic. In the extreme scenario where the Russian Federation splinters, and the eastern states of that federation find themselves without a way to make ends meet, China might make some very favorable deals in the region. Hell I wouldn’t be surprised if several of them ended up federalizing with China (or something very similar; some form of vassalage).
And with global warming comes two huge boons:
Siberia’s tundra thawing, making it easier to access untapped resources.
North pole remains largely ice-free for at least parts of the year, making shipping between eastern Asia and Europe cheaper and faster.