Russia still has a lot of anti-american views, and they no longer view us as a Christian nation/similar goals.
Plus China has similar goals in terms of power and political systems, so as much as Russia would hate to partner with China, they would hate to partner with the US even more.
So what happens when China tries to take over the world?
Unless China runs Russia like they do the United States, wouldn't they be an ally?
Russia still has a lot of anti-american views, and they no longer view us as a Christian nation/similar goals.
Plus China has similar goals in terms of power and political systems, so as much as Russia would hate to partner with China, they would hate to partner with the US even more.