Between the main island and some offshore islands I think
China has always been consistent on certain issues:-
1. No external interference in local politics
2. Taiwan is part of CHina
3. They WILL invade Taiwan if it declares independence
4. There is some flexibility on modes of Govt - eg Hong Kong & Macao
5. Existing external borders can be negotiated/altered in face to face negotiations between the parties
But they are big and carry a stick that is getting bigger every day