The Hague Convention does not apply unless both countries concerned (the country of the child’s normal residence, and the country to where he has been abducted) are parties to the Hague Convention.
In cases where the Hague convention does not apply, the non-removing parent will have to apply in the courts, either of his home country, or the country to where the child has been abducted, for an order giving him ‘custody’ and/or for the return of the child to the place of his normal residence.
The courts of most countries base their decision concerning children on the principle of the ‘welfare’ or ‘best interests’ of the child. The court may therefore investigate the facts of the case and make a decision based on what are called the ‘merits’ of the case in accordance with what it considers to be best for the child’s welfare.
In some countries however, the courts take the view that the principles of the Hague Convention (that international abduction should be discouraged, and custody disputes are best decided by courts in the country while the child has been normally resident), should still apply, even if the two states involved are not bound by it. In this case the court will be very tempted to return the child, as if the Hague Convention principle applies, unless there is some issue about the child’s welfare which makes a return not appropriate.