Maybe I can start.
I think right now the most significant form that it's taking is that China is effectively blunting the impact of global sanctions against Russia. Sanctions have proven quite effective at tanking an economy, causing economic pain and immiseration. China is blunting that effort. For instance, the Russian car industry has effectively collapsed, but Russians can now buy very good Chinese cars instead. That extends to the military and defence industrial production, as I mentioned.
What is China getting in return? Well, China is getting, I think, access to Russian military technology that's more advanced than what it has: things like aircraft engines, perhaps missile defence, fighter designs and other technology related to kind of advanced systems.
Then, as I mentioned, China is also seemingly getting more access in the Arctic and other places. Maybe just a quick point is that I think we have oftentimes thought that we could wedge these two countries—Russia and China—because of the conflict that emerged during the Cold War because of Nixon's visit to China. However, after the death of Stalin, that has also stemmed from competition within the Communist world over leadership and a 10-year rivalry between China and Russia. What we've seen now is a more than 10-year effort by both Putin and Xi to build ties. Because both leaders really buy into this relationship, I think it's quite durable, and that's extending deep down into the bureaucracies, militarily and economically.