WASHINGTON - A prominent United States expert on Pakistan has warned the Bush administration against conducting unilateral raids into Pakistani territory, saying the policy "threatens cooperation between the two countries, possibly to the breaking point". "Terrorist sanctuaries are unacceptable. But eliminating them requires Pakistan's cooperation, Terrorist sanctuaries are unacceptable. But eliminating them requires Pakistan's cooperation." Marvin Weinbaum, who is also a former State Department official, said. "In its eagerness to reverse the mounting insurgency in Afghanistan, the United States has embarked on a policy course that could shatter our vital strategic partnership with Pakistan," he wrote in The Washington Post on Monday. Stating that there are no quick fixes to the problem of extremism,  Weinbaum, who is associated with The Middle East Institute, said while Washington's concerns with regard to dealing with violent extremists are understandable, "there is too much at stake for the United States to risk dangerous, misguided policies." "Neither intrusions by US Special Forces nor missile attacks by drones will, by themselves, take out the thousands of insurgents and their allies along the frontier. They also cannot seriously disrupt the global terrorist network." The cooperation of the Pakistani military and its intelligence services, working with a civilian government, remains indispensable, he pointed out. ZARDARI Weinbaum wrote, "While there is some comfort to be found in President Asif Ali Zardari's views on combating terrorism, having Zardari as Musharraf's replacement in the role of U.S. point man will not help to build build a popular consensus against extremism. Just last week the Parliament voted unanimously to condemn the latest U.S. missile attack on Pakistani territory. If Zardari tries to blunt criticism of the United States, his governing coalition could be threatened. And the likely victor as prime minister in a new election, Nawaz Sharif, has a strongly jaundiced view of U.S. involvement in the frontier and Afghanistan." Weinbaum welcomed proposals geared toward helping the United States regain the trust of Pakistanis and said steps like the Biden-Lugar bill recognize the importance of nonmilitary assistance that addresses Pakistan's endemic social problems and infrastructure deficits. Measures that help Pakistan weather its economic crisis will have an effect, as will a more favourable trade policy, especially on textiles. The United States can also be more convincing in its commitment to civilian rule and democracy, he added.   "By contrast, openly violating Pakistan's territory will make matters worse. And Pakistan can easily retaliate. Most supplies for U.S. and coalition forces in Afghanistan are delivered to the port of Karachi and then shipped by road to Afghanistan."