Yep. The current China/Russia alliance is a very temporary one of convenience.
China has some very old maps which they use as a basis to claim Siberia and the western Pacific as their own. The trick for the ChiComs will be to wait for Russia to collapse while avoiding a collapse of their own.
The ChiCom dream:
"Chinese" source: New York Times, 2014/07/04. Labeled in modern English and all, so it must be "...very old maps which they use as a basis to claim Siberia and the western Pacific as their own."