Although there is no judgement enforcement treaty between most countries and the United States, normally US courts will enforce a validly entered foreign judgement. The US court will require that the US based judgement debtor was aware of the foreign proceedings.
Enforcement of a Foreign Judgment in the U.S. Under U.S. law, an individual seeking to enforce a foreign judgment, decree or order in this country must file suit before a competent court. The court will determine whether to recognize and enforce the foreign judgment.
The SPEECH Act prohibits any domestic court from recognizing or enforcing a foreign defamation judgment if the foreign jurisdiction's libel laws do not provide as much protection to speech as does the First Amendment and/or the libel law of the state in which the domestic court sits.
Enforcement of a Foreign Judgment in the U.S. Under U.S. law, an individual seeking to enforce a foreign judgment, decree or order in this country must file suit before a competent court. The court will determine whether to recognize and enforce the foreign judgment.
To register a foreign judgment, one must file a new California lawsuit. If the California court recognizes the decision from the foreign court, it will issue an essentially identical judgment.
Under CPLR § 5402(a), to recognize a foreign judgment, a judgment creditor must: (1) file the foreign judgment within 90 days of the date of the judgment's authentication in the office of any county clerk of the state; and (2) file an affidavit, stating (i) that the judgment was not obtained by default in appearance or ...
What this means is that a creditor has to register his out-of-state judgment in the new state in order to enforce the judgment under the laws of the new state.
To do so, you will need to file a petition to recognize the foreign divorce decree in the Superior Court of California in the county where you reside. You will need to provide a certified copy of the foreign divorce decree, along with any translations if necessary.