counterproposal on 7 June 2007 which was declined. Russia suspended its participation in the Conventional Forces in Europe treaty on 11 December 2007. Putin opposed Kosovo's unilateral declaration of independence from Serbia on 17 February 2008, warning that it would destabilize the whole system of international relations. He described the recognition of Kosovo's independence by several major world powers as "a terrible precedent, which will de facto blow apart the whole system of international relations, developed not over decades, but over centuries", and that "they have not thought through the results of what they are doing. At the end of the day it is a two-ended stick and the second end will come back and hit them in the face". In March 2014, Putin used Kosovo's declaration of independence as a justification for recognizing the independence of Crimea, citing the so-called "Kosovo independence precedent". After the 9/11 attacks on the U.S. in 2001, Putin had good relations with American President George W. Bush, and many western European leaders. His "cooler" and "more business-like" relationship with German chancellor, Angela Merkel is often attributed to Merkel's upbringing in the former DDR, where Putin was stationed as a KGB agent. He had a very friendly and warm relationship with the former Prime Minister of Italy Silvio Berlusconi; the two leaders often described their relationship as a close friendship, continuing to organize bilateral meetings even after Berlusconi's resignation in November 2011. The NATO-led military intervention in Libya in 2011 prompted a widespread wave of criticism from several world leaders, including Putin, who said that the United Nations Security Council Resolution 1973 is "defective and flawed", adding: "It allows everything. It resembles medieval calls for crusades." In late 2013, Russian-American relations deteriorated further when the United States canceled a summit for the first time since 1960 after Putin gave asylum to American Edward Snowden, who had leaked massive amounts of classified information from the NSA. In 2014, Russia was suspended from the G8 group as a result of its annexation of Crimea. Putin gave a speech highly critical of the United States, accusing them of destabilizing world order and trying to "reshape the world" to its own benefit. In June 2015, Putin said that Russia has no intention of attacking NATO. On 9 November 2016, Putin congratulated Donald Trump on becoming the 45th president of the United States. In December 2016, US intelligence officials (headed