<p>The U.S Foreign policy during the Soviets encroachment of Afghanistan at the height of Cold War has been evaluated, as well as its negative effects in Afghanistan-Pakistan (Af-Pak). During 1979, Union of Soviet Socialist Republics (U.S.S.R) landed on Afghanistan in order to secure Warm Water Ports and Persian Gulf Oil. (This was called as the “Soviet Invasion of Afghanistan”). By having this situation, The U.S government established a mission in Afghanistan which consisted on two main purposes. One of them was to stand against the invasion of Afghanistan provoked by U.S.S.R. and the second one was to provide Afghan Mujahedeen Movements with some help and be prepared for the coming situation. So, the provision of the most dangerous weapons and the need of billions of dollars were made to these fundamentalist Afghan mujahedeen. Thus, they could protect themselves and fight against the U.S.S.R invasion. As a matter of fact, the Taliban groups were founded due to U.S policy. Nevertheless, the establishment of them has become the biggest general threat to global peace, particularly for Afghanistan and Pakistan. This research consists of three parts which are going to be developed in the order as follows: The internal milieu of Afghanistan and the intervention by U.S.S.R, The U.S policy interests and the outcomes of these policies, The Afghan and Pakistan consequences which were gotten by these policies. This Research is going to be a new source of knowledge for understanding the U.S foreign policy during this War and their negative effects on Afghanistan and Pakistan such as refugee’s settlement and number of other problems. Although Americans just revenge from Soviets but this game also destroyed the Pakistan. Also as an explanation on the nowadays coming international terrorism and how the Afghan insurgents have become strong enough. </p>