6.2.6 Generally, a foreign state is immune from the jurisdiction of Singapore unless it has submitted to the jurisdiction of Singapore (Civil Aeronautics Administration v Singapore Airlines Ltd [2004] 1 SLR 570). There are other exceptions, which can be found in the State Immunity Act, Cap 1985 Ed. Additionally, there exists the doctrine of judicial restraint, the scope of which is uncertain, which prescribes that the court should refrain from adjudicating questions involving disputes between states on questions of public international law (Buttes Gasand Oil Co v Hammer [1982] AC 888).