(1) Except as otherwise provided in section 711, if a foreign country lacks or refuses to exercise jurisdiction to modify its child-support order according to its laws, a tribunal of this state may assume jurisdiction to modify the child-support order and bind all individuals subject to the personal jurisdiction of the tribunal whether the consent to modification of a child-support order otherwise required of the individual under section 611 has been given or whether the individual seeking modification is a resident of this state or of the foreign country.

    (2) An order issued by a tribunal of this state modifying a foreign child-support order under this section is the controlling order.

    A party or support enforcement agency seeking to modify, or to modify and enforce, a foreign child-support order not under the Convention may register that order in this state under sections 601 through 608 if the order has not been registered. A petition for modification may be filed at the same time as a request for registration or at another time. The petition must specify the grounds for modification.