How to enable tag moderation using rules?
I think this module Content Moderation is help to create rules


  
  Some selected group should first review those changes (based one a    specific revision marked for "approval). In the meantime others
  should be able to edit and create new revisions (which are not part
  of this approval process)
  Later some group can approve that revision and make it the new    live-version
  Every state change (review, approval..) should get logged in a    history. You always want to know, who reviewed / approved what, when
  and what revisions
  You want to have a different workflow, like some other states between    review and approve and live. You want to define your own
  workflow.
  You want to create ToDo list for you reviwer / approval teams