In 2009 Sweden agreed to enter into mutual self-defence treaties with the EU, and with other Nordic countries, thus ending a nearly 200 year long period of official military neutrality. As a result of a 2010 U.S. diplomatic cables leak, it was learned that the United States government had described Sweden's "official security policy" as "non-participation in military alliances during peacetime and neutrality during wartime." However, Sweden does contribute to various NATO and EU battlegroups and is involved in international organizations. From March–October 2011, Sweden was a participant in the NATO-led international contingent in the War in Libya. In May 2016, a survey showed for the first time that more Swedes favored NATO membership than opposed it. All of the political parties that are part of the right-of-centre coalition favor full NATO membership.