The issue here is three keywords: unity, success and sustainability. All three elements are being looked at by the Chinese. If the west shows all three, it will potentially have a deterrent effect on China. If one of them fails or is not being sustained, the Chinese may draw different lessons from it.
Chinese policy, to sum it up very briefly, is a policy of clear neutrality: support Russia and pay no price. Those are the limits of Chinese support for the unlimited friendship with Russia. It is China first.