Since 1989, Hungary's top foreign policy goal has been achieving integration into Western economic and security organisations. Hungary joined the Partnership for Peace programme in 1994 and has actively supported the IFOR and SFOR missions in Bosnia. Hungary since 1989 has also improved its often frosty neighbourly 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 Romania, Slovakia, and Serbia periodically cause bilateral tensions to flare up. Since 2017, the relations with Ukraine rapidly deteriorated over the issue of the Hungarian minority in Ukraine. Since 1989, Hungary has signed all of the OSCE documents, and served as the OSCE's Chairman-in-Office in 1997. Historically, Hungary has had particularly friendly relations with Poland; this special relationship was  recognized by the parliaments of both countries in 2007 with the joint declaration of March 23 as "The Day of Polish-Hungarian Friendship".