Technically speaking, you're probably correct about this. However, I suggested yesterday that the governors of those states where the six P&O-operated ports are located could probably do a lot of damage to the deal simply by suggesting that they will make every attempt to terminate P&O's existing contracts upon completion of the sale to the UAE-owned company.
I think the legal departments of each of these states will advise their respective Governors that they would risk HUGE lawsuits by meddling in the business affairs of two foreign nations. Anti-trust is a bitch.