(a) Except as otherwise provided in § 6-711 of this title, if a foreign country lacks or refuses to exercise jurisdiction to modify its child-support order pursuant 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 pursuant to § 6-611 of this title has been given or whether the individual seeking modification is a resident of this State or of the foreign country.
(b) An order issued by a tribunal of this State modifying a foreign child-support order pursuant to this section is the controlling order.