The Iranian revolution spelled the end of the organization in 1979, but in reality, it essentially had been finished since 1974, when Turkey invaded Cyprus. This led the United Kingdom to withdraw forces that had been earmarked to the alliance, and the United States Congress halted military aid to Turkey despite two Presidential vetoes. With the fall of the Iranian monarchy, whatever remaining rationale for the organization was lost. Future U.S. and British defence agreements with regional countries—such as Pakistan, Egypt, and the Persian Gulf states—were conducted bilaterally.