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This can be considered to be a case of parental abduction.
It is essentially that you act quickly or you won't be able to address this for some time.
She had no right to remove the children from their habitual place of residence without your permission or a court order.
I suggest you find a lawyer immediately or else self-represent and bring an application on an emergency, ex parte (without notice) basis for interim sole custody so you can bring the children home.