It is important to keep in mind that divorce decrees passed by Indian courts are valid in other countries just like marriages that are registered in India are valid in foreign countries. Basically, no foreign court is going to question if the decree passed by an Indian court on a matter of divorce of a couple married in India is invalid.
The divorce decree needs to be recognized in the foreign country if the couple jointly owns property in that country. Such recognition is gained by filing a petition for recognition in such country in accordance with their laws. This is the last legal requirement for finalizing a divorce in case the divorcing individuals are non-resident Indians.