It isn't Russia, it's every country in the world against China. If you look at a map, you see clearly how ugly the Chinese government is. There's no logic to say those waters are Chinese. It's one of the few times where Russia and the US are on the same side.
Even those countries that are quite near in the island doesn't mind to claim that they own that land and this Chinese that is very far on that Island still want to insists that they own the island.
Those Chinese arent too greedy, what you think?. Claiming lands thats too far away from their teritory. I think theres something on that island that no one knows because they still claiming that land even theyre already lose in the case regarding to island dispute.