Russia and China: Benign Friendship or Malignant Game-Changer?

Recent years have seen the old Communist enemies grow closer five decades after Kissinger’s opening to China.  Are we back to a new Cold War with the US and the West facing a united Russo-China front?  Both Moscow and Beijing share a deep resentment against Washington, propounding an alternative vision of non-US-dominated world order.  But, in a switch, is Moscow willing to be the junior partner to China?  Or is a growing friendship a tactical move until Russian sanctions are dropped and China attains better terms with the US?  A real alliance or a marriage of convenience?