U.S. governments have been questioning the contribution of the NATO alliance for the last two decades. Although the U.S. pioneered the enlargement of the alliance, it mostly prefers to act unilaterally in its security policy, which creates problems for NATO.
In fact, potential cooperation between China and Russia is mentioned as one of the significant threats for U.S. foreign policy. Of course this is the perspective of the U.S. and it is possible to read most of the decisions given by the U.S. administrations in the last few years in accordance with this changing threat assessment and perception.
In 2005, during a visit to troops in Iraq, U.S. Secretary of Defense Donald Rumsfeld reportedly said, "We don't have an exit strategy, we have a victory strategy." The true meaning of this statement and its potential repercussions for the U.S. strategy in Iraq is a matter of debate among scholars.