The Byelorussian SSR was one of only two Soviet republics to be separate members of the United Nations (the other being the Ukrainian SSR). Both republics and the Soviet Union joined the UN when the organization was founded in 1945.
After the dissolution of the Soviet Union, at which time Belarus gained its independence, Belarus became a member of the Commonwealth of Independent States (CIS), the Organization for Security and Cooperation in Europe (OSCE), NATO's Partnership for Peace, the North Atlantic Cooperation Council, the International Monetary Fund, and the World Bank. It has also been in a supranational union with Russia since 2 April 1996, although this has had little practical effect.
The introduction of free trade between Russia and Belarus in mid-1995 led to a spectacular growth in bilateral trade, which was only temporarily reversed in the wake of the financial crisis of 1998. President Alexander Lukashenko sought to develop a closer relationship with Russia. The framework for the Union of Russia and Belarus was set out in the Treaty On the Formation of a Community of Russia and Belarus (1996), the Treaty on Russia-Belarus Union, the Union Charter (1997), and the Treaty of the Formation of a Union State (1999). The integration treaties contained commitments to monetary union, equal rights, single citizenship, and a common defence and foreign policy.