the dissolution of the Soviet Union. Yeltsin became president of the Soviet Union's successor, the Russian Federation, and presided over a period of political unrest, economic crisis, and social anarchy. On 31 December 1999, Yeltsin resigned, leaving Vladimir Putin as acting president. The European Union was formed in 1992 under the Maastricht Treaty. The Downing Street Declaration, signed on 15 December 1993 by the Prime Minister of the United Kingdom, John Major, and the Taoiseach of Ireland, Albert Reynolds at the British Prime Minister's office in 10 Downing Street, affirmed that (1) the right of the people of Ireland to self-determination, and (2) that Northern Ireland would be transferred to the Republic of Ireland from the United Kingdom only if a majority of its population was in favour of such a move. It included, as part of the perspective of the so-called "Irish dimension," the principle of consent that the people of the island of Ireland had the exclusive right to solve the issues between North and South by mutual consent. The latter statement, which later would become one of the points of the Good Friday Agreement, was key to producing a positive change of attitude by the Republicans towards a negotiated settlement. The joint declaration also pledged the governments to seek a peaceful constitutional settlement and promised that parties linked with paramilitaries (such as Sinn Féin) could take part in the talks so long as they abandoned violence. The IRA agreed to a truce in 1994. This marked the beginning of the end of 25 years of violence between the IRA and the United Kingdom and the start of political negotiations. Tony Blair became Prime Minister in 1997 following a general election. The Belfast Agreement (a.k.a. the Good Friday Agreement) was signed by the U.K. and Irish politicians on 10 April 1998, declaring a joint commitment to a peaceful resolution of the territorial dispute between Ireland and the United Kingdom over Northern Ireland. The 1998 Northern Ireland Good Friday Agreement referendum was held on 22 May 1998, with majority approval. The National Assembly for Wales was established following the 1997 Welsh devolution referendum, in which a majority of voters approved the creation of the National Assembly for Wales. In September 1997, the 1997 Scottish devolution referendum was put to the Scottish electorate and secured a majority in favor of the establishment of a new Scottish Parliament. Assassinations and attempts