Finnish foreign policy emphasises its participation in multilateral organisations. Finland joined the United Nations in 1955 and the European Union in 1995. As noted, the country also is a member of NATO's Partnership for Peace as well as an observer in the Euro-Atlantic Partnership Council. The military has been prepared to be more compatible with NATO, as co-operation with NATO in peacekeeping is needed, but military alliance does not have popular support. Political scientist Teija Tiilikainen has attributed tensions like this one to the importance that Finland's political identity places on sovereignty and the (sometimes competing) stress it places on international cooperation.