After the &lt;a href="9/11%20attacks"&gt;9/11 attacks&lt;/a&gt;, Putin supported the U.S. in the War on Terror, thus creating an opportunity for deepening the relationship with the leading Western and NATO power. On 13 December 2001, Bush gave Russia notice of the United States' unilateral withdrawal from the Anti-Ballistic Missile Treaty. From Russia's point of view, the US withdrawal from the agreement, which ensured strategic parity between the parties, destroyed hopes for a new partnership. Russia opposed the expansion of NATO which happened at the 2002 Prague summit. Since 2003, when Russia did not support the Iraq War and when Putin became ever more distant from the West in his internal and external policies, the relations remained strained. In an interview with Michael Stürmer, Putin was quoted saying that there were three questions which most concerned Russia and Eastern Europe; namely the status of Kosovo, the Conventional Forces in Europe treaty and American plans to build missile defence sites in Poland and the Czech Republic, and suggested that all three were some way linked. In Putin's view, concessions on one of these questions on the Western side might be met with concessions from Russia on another.