| After the disintegration of the Soviet Union, America competitors disappear, and with rapid growth of economic and military, America superiority become more and more strong, and require other country establishing quality "democratic" political system around the world follow.America is being superpower in the international pattern, and foreign policy is took by America interest oriented. On Ukraine policy, the prevention and control of Russia rise once again to challenge American dominance is the baseline on Ukraine policy.In the period of George W. Bush, America government took unilateral military diplomacy under the interference of the Neoconservatives and broadcast democracy all over the world through the use of force. In the policy of Ukraine, American,basing on the Russian powerful military, take peaceful measures to drive a wedge between Ukraine and Russia. In twenty-first Century, America achieve overall strategic layout through the use of Ukraine to join NATO Security, a large amount of financial aid and supporting the temptation to dear Western opposition.In the unilateral military policy, America suffered more and greatly damaged the image in the world. Obama take a more moderate foreign policy after power and not like tough George W. Bush, and but use more "clever diplomacy" to inherit the previous government’s foreign policy. In dealing with the issue of Ukraine, the Obama administration has not changed the direction and take roundabout and euphemistic policy basing on the complex current and volatile international environment, and sometimes even can make concessions.At the beginning of twenty-first Century, two government of America policy effects on Ukraine seem not toward the desired direction of American, but appeared opposite results from the development of Ukraine’s overall domestic. Ukraine politicsl, economy, security and foreign affairs have appeared the worst case since independence, which is attributed to many factors and not only includes the inner weak foundation mechanism, but also Russia and European Union. Under the influence of multiple factors, the policy is difficult to achieve the scheduled goal, and sometimes hinder the development of Ukraine.In the last, the article summarizes the background of implementation of America foreign policy, and in the complex international relations any other conflict power will affect the establishment and implementation of another policy. In the current international background, it is necessary to take a complete comb about USA policy, and in order to China in the development process to be able to do to know yourself as well as the enemy, and to make the right countermeasures in the face of the bilateral relationship conflict. |