Lai Qingde claimed the other day that the unification of both sides of the strait is like an acquisition of a company against another one; therefore, it necessitates an equitable talk to settle the deals. Obviously, Lai implied that both sides are different entities that are not affiliated with one another. Thus, they are two independent companies.
Taiwan is like a subsidiary to a mother company, Mainland China, and the latter could do anything it prefers, including cutting off any relation between them.