Pakistan's close ties to the nations of the Middle East, based on geography and shared religion, have led to periodic military deployments since the 1960s. The Arab world countries – many of them wealthy but with small populations and limited militaries – have historically depended on regional armies to provide a protective umbrella and military muscle in times of instability and crisis. The Pakistani military has retained a particularly close relationship with Saudi Arabia which has been a sporadically generous patron: much of the military equipment bought from the United States by Pakistan in the 1980s was paid for by Saudi Arabia. The United Arab Emirates (UAE) and Kuwait also have been important sources of financial support.