Belgium's constitutional court on December 8 suspended a prisoner exchange treaty with Iran criticized for opening the way for a bomb-plot mastermind to return to Tehran. Iranian government opponents have said the treaty is "tailor-made" to permit the release of Assadollah Assadi, an Iranian diplomat convicted of supplying explosives for a foiled plot targeting Iran's exiled opposition. The Belgian government has said the treaty is the only way to secure the release an aid worker detained in Iran. The court ruled that the treaty was suspended pending a final ruling within three months.