 In the spring of 1986, an offensive into Paktia Province briefly occupied the mujahideen base at Zhawar only at the cost of heavy losses.Meanwhile, the mujahideen benefited from expanded foreign military support from the United States, Saudi Arabia, Pakistan and other Muslim nations.The US tended to favor the Afghan resistance forces led by Ahmed Shah Massoud, and US support for Massoud's forces increased considerably during the Reagan administration in what US military and intelligence forces called "Operation Cyclone".