As with any country, Hungarian security attitudes are shaped largely by history and geography. For Hungary, this is a history of more than 400 years of domination by great powers--the Ottomans, the Habsburgs, the Germans during World War II, and the Soviets during the Cold War--and a geography of regional instability and separation from Hungarian minorities living in neighboring countries. Hungary's foreign policy priorities, largely consistent since 1990, represent a direct response to these factors. Since 1990, Hungary's top foreign policy goal has been achieving integration into Western economic and security organizations. To this end, Hungary joined NATO in 1999 and the European Union in May of 2004. Hungary also has improved its often-chilled neighborly relations by signing basic treaties with Romania, Slovakia, and Ukraine. These renounce all outstanding territorial claims and lay the foundation for constructive relations. However, the issue of ethnic Hungarian minority rights in Slovakia and Romania periodically causes bilateral tensions to flare. Hungary was a signatory to the Helsinki Final Act in 1975, has signed all of the CSCE/OSCE follow-on documents since 1989, and served as the OSCE's Chairman-in-Office in 1997. Hungary's record of implementing CSCE Helsinki Final Act provisions, including those on reunification of divided families, remains among the best in eastern Europe. Hungary has been a member of the United Nations since December 1955.