Relations between the United States and Iraq became strained following the overthrow of the Iraqi monarchy on July 14, 1958, which resulted in the declaration of a republican government led by Brigadier Abd al-Karim Qasim. On June 25, 1961, Qasim mobilized troops along the border between Iraq and Kuwait, declaring the latter nation "an indivisible part of Iraq" and causing a short-lived "Kuwait Crisis". The United Kingdom—which had just granted Kuwait independence on June 19, and whose economy was dependent on Kuwaiti oil—responded on July 1 by dispatching 5,000 troops to the country to deter an Iraqi invasion. At the same time, Kennedy dispatched a U.S. Navy task force to Bahrain, and the UK, at the urging of the Kennedy administration, brought the dispute to United Nations Security Council, where the proposed resolution was vetoed by the Soviet Union. The situation was resolved in October, when the British troops were withdrawn and replaced by a 4,000-strong Arab League force, which acted as a barrier against the Iraqi threat.