You would need to answer the petition using as defenses no jurisdiction and no venue. The OK court website may have some forms and information that would be of help. Be sure to send everything to the court CRRR and properly copy his attorney.

Is there any marital property, custody or alimony issues? If not, you may want to go ahead with the OK divorce. You can also start your own case and then ask the OK court to dismiss if the court in your state would be a more convenient forum.