Lithuania joined the United Nations on September 17, 1991. On May 31, 2001, Lithuania became the 141st member of the World Trade organisation. Since 1988, Lithuania has sought closer ties with the West, and so on January 4, 1994, it became the first of the Baltic States to apply for NATO membership. On November 21, 2002, NATO invited Lithuania to start membership negotiations, and on March 29, 2004, it became a full and equal NATO member. On February 1, 1998, it became an Associate Member of the European Union, and on April 16, 2003, it signed the EU Accession Treaty. 91% of Lithuanians backed EU membership in a referendum held on May 11, 2003 and on May 1, 2004, Lithuania joined the European Union.
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