Not all of  EWHC 1579 (Fam) RJ v Tigipko is easily understood. Detail is kept private and proceedings were conducted in camera for evident reasons. The case concerns an earlier order to return a child from the Ukraine, which was followed up by an unsuccessful appeal to the Ukrainian courts to recognise this order under the 1996 Hague convention. Application in England now is to beef up the return order.
What is of interest to the blog is the consideration of action against the maternal grandfather. From the little detail in the judgment one can infer that he is complicit in the parental kidnapping. What exactly is being asked from him is not made clear however it is not quite like an anti-suit but rather (at 21) ‘a mandatory injunction requiring a party to commence and act in a foreign suit in a certain way, which is an order.’ Here, at 20, Mostyn J would seem to be minded to apply CJEU C-159/02 Turner v Grovit to Hague Convention States.
That, I would suggest, is a bold move not supported by either authority or spirit of EU law. Full argument on it will be heard later.
(Handbook of) EU private international law, 2nd ed. 2016, Chapter 2, Heading 2.2.1.