Wiener Übereinkommen über das Recht der Verträge
Serbia was threatened by NATO with armed attack if Serbia refused to sign the Rambouillet Agreement, an agreement that Serbia in the end refused to sign. It has been argued that pursuant to Article 52 of the 1980 Vienna Convention on the Law of Treaties, had Serbia signed the Rambouillet Agreement, the agreement would have been void due to the threat or use of force to compel Serbian acceptance.