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Mindful of its declining appetite for projecting power in the Middle East, the U.S. is relying on more activist partners in the region such Qatar, Saudi Arabia and Turkey to arm the Syrian rebellion. But Tuesday’s visit to Gaza by Qatar’s Sheikh Hamad bin Khalifa al-Thani — to the delight of the territory’s Hamas rulers and Egypt’s Muslim Brotherhood, while Israel and Fatah fumed — was a reminder that U.S. allies in the region often pursue goals quite different from those of Washington, despite many shared objectives and common enemies.