Under the State Immunity Act, foreign states are generally immune from being sued in Canada. This includes being sued on a foreign judgment. However, in 2012 Canada enacted legislation to give victims of terrorism the ability to sue a foreign state that sponsored the terrorism. It also made it easier for foreign judgments against such a state to be enforced in Canada.
In Tracy v The Iranian Ministry of Information and Security, 2016 ONSC 3759 (released June 9, 2016; likely to be posted in the week of June 13, 2016, in CanLII) the Ontario Superior Court of Justice had to consider these legislative reforms and how they applied to a series of American judgments rendered against Iran in favour of American victims of terrorist acts which Iran was found to have sponsored. The court held that Iran was not immune from the enforcement proceedings and that accordingly the American judgments were enforceable against certain assets of Iran in Ontario.