The United States was met with strong opposition from Russia and China as well as its European allies after putting forward the NMD plan. The NMD plan has sparked a fierce debate between the two sides on the Atlantic Ocean. Europe's opposition against the NMD plan stems from multiple concerns. Firstly, most of the European countries view that the United States overestimates the threat posed by the so-called “rogue states". Secondly, European countries are concerned that the United States tearing up the ABM treaty unilaterally may trigger a new round of arms race which will intensify the US-Russian relations and threaten European security. Thirdly, none of the European countries is willing to accept the US NMD technology with concerns that they might again become US' protectorates. What's more, France fears that the deployment of NMD may neuter its nuclear deterrents and Germany worries that it may occur differing levels of security within NATO, leading to a split between the United States and Europe on security. US announcement of delaying the deployment of NMD will mitigate the contradictions between the US and Europe, but can not eliminate their divergence. European countries will continue to impose pressure on Washington. Britain, as the closest ally of the United States, plays the most important role in dealing with the NMD issue. It will be a heavy blow to the United States if Britain could joint with France and Germany in fighting against the US NMD plan. However, if the next US administration decided to press ahead the NMD plan, European countries would urge Washington to make certain concessions to Russia in order to avoid US unilateral abrogation of the 1972 treaty.