Read this: A multilateral treaty is concluded among several countries. The agreement establishes rights and obligations between each party and every other party. Multilateral treaties are often regional.[citation needed] Treaties of "mutual guarantee" are international compacts, e.g., the Treaty of Locarno which guarantees each signatory against attack from another.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): Between which parties does a multilateral treaty establish rights and obligations?
each party and every other party