The ratification of international treaties is accomplished by filing instruments of ratification as provided for in the treaty. In most democracies, the legislature authorizes the government to ratify treaties through standard legislative procedures (i.e., passing a bill).
In the UK, treaty ratification is a [[Royal Prerogative]], exercised by [[Her Majesty's Government]]; however, by convention called the [[Ponsonby Rule]], treaties are usually placed before parliament for 21 days before ratification.
In the US, the treaty power is a coordinated effort between the Executive branch and the Senate. The President may form and negotiate a treaty, but the treaty must be advised and consented to by a [[two-thirds majority|two-thirds vote]] in the [[United States Senate|Senate]]. Only after the Senate approves the treaty can the President ratify it. Once a treaty is ratified, it becomes binding on all the states under the Supremacy Clause. While the [[United States House of Representatives]] does not vote on it at all, the requirement for Senate advice and consent to ratification makes it considerably more difficult in the US than in other democratic republics to rally enough political support for international treaties. Also, if implementation of the treaty requires the expenditure of funds, the House of Representatives may be able to block, or at least impede, such implementation by refusing to vote for the appropriation of the necessary funds.