I would suggest causality runs the other way.

Populations with fewer resources / less security than their parents marry and reproduce less and later.

David Ricardo was writing about that before 1800... 

 We have an expanding services sector and a shrinking industrial sector, we're aging and becoming infertile, housing starts are crashing, etc. 

 That must make Chinese policymakers very happy. Russia's too, outside Gazprom.

Prospective immigrants, not so much. But maybe "if its free, its Halal"... 

 Russia's newer pipelines will be less profitable than their EU ones. The Chinese know that they can get a discount because the West isn't bidding, anymore. 

 True, but their hit to margins won't be anything like the mark-up you guys are paying for LNG.

China, Japan and Korea are buying our gas at hefty price increases compared to previous years, so Russia alone isn't able to meet China's increase in demand.., 

 China is declining, tho, and India is going heavy on coal and nuclear. 

 China is going through some political stupid at the moment, but its so opaque and centralised its impossible to know which way it will move afterwards.

India have their own coal and nuclear fuels, they'd be mad not to use them. They do import our gas, though.

In my grandfather's day, Australia was the world's lowest-cost aluminium producer, and a major steelmaker. All gone. Politics is upstream from economics... 

 China's population is aging and shrinking. India has another couple of decades, before it hits that and it won't hit as hard. 

 So long as we keep paying migrants to come, they will keep coming. 🤷‍♀️

I still have no idea what the ethnic Germans want to do with all of these people. Even more bizarre than the nuclear energy psychosis.