Russian Chinese is better.
Only because it is probably more likely they'll start shooting at each other before they start shooting at us...
1. The Russians and Chinese will never have a solid alliance. They couldn't do it during communism, and they both fully distrust one another.
2. Obviously you don't know the state of the Russian military. It's BROKEN and it's conscription pool dwindles daily. Hard to fill the ranks out when the average conscript has a chronic illness, alcohol or drug addiction, and/or a mental illness. The healthy conscript age men find ways to pay the bribes that get them out of the draft.