Rene and Angela had been married for seven years and had a 5- year-old son, Pierre. When they divorced, Angela was granted physical custody, and Rene had "reasonable" visitation rights. Rene was very unhappy with the custody award and, during one of his "visits", took Pierre and returned with him to his native France without the consent of either Angela or the court. Which of the following may be most helpful to Angela, whose son has been wrongfully removed from the United States