Why would the West go to war over natural resources when the environmentalist would NEVER allow them to mine or recover it? The Western model is to obtain raw resources from third world countries where the cost to mine them is minimal and nobody cares about the welfare of the laborers. China has taken over as the source via their Belt and Road Initiative and same thing - they can take the resources back to China, make things cheaply, and nobody cares about environmental or workplace safety concerns.
Your idea is sound in one respect though - China very much covets (and even has a historical ownership claim) Siberia. China shares a common border and the history of the region is muddled when you go back hundreds of years. Many Chinese feel that claims that old are still valid today. China would love to exploit the natural resources of China and they could build the infrastructure that Russia cannot afford.
The globalists are using the environmentalists to run up the cost of resources, to shut down the resource industry. The environmentalists are useful idiots and nothing more than that.
When the globalists own the resources, they would happily put a bullet in each environmentalists head to get them out of the way. Environmentalists are noisy, but they serve a purpose.