Suing a foreign government is a tricky proposition, with all sorts of legal hurdles to be cleared before a filing can even take place. So Maria Altmann has learned in her battle to get back six Gustav Klimt paintings looted from her family’s collection by Nazis in World War II and currently in the possession of the Austrian government. This week, the 9th Circuit Court of Appeals ruled that Altmann’s suit can go forward in a U.S. court, and closed the door on any further stalling tactics by the Austrians. Austria has one appeal still available to it – the U.S. Supreme Court – but no decision has been made on whether such an appeal will be filed.