What teammates? Thats a loooong time gone. We were allies, friends or teammates back when Stalin was alive, we are business partners at best today. Theres absolutely no difference between our relationship with the one we have with India or even Turkey. We are paying for absolutely everything we take from you, your banks and China as a whole are in compliance with pretty much all of the western sanctions against us. If theres a minimal chance for you to be hit with sanctions by your real partners in Washington you dont even move your finger.
But the good thing is that sooner or later, the US and its satellites will start choking you for real and absolutely noone will move its finger to help you.
As for North Korea, you are right I admit. They fought side by side with us in Kursk something that the Chinese will never make for anyone, nor I expect them to ofc.
EDIT:
I must say that our Iranian friends also helped us with the drones. A help that noone in Russia will forget.