section_path: Background/Independent Ukraine and the Orange Revolution
section_name: Independent Ukraine and the Orange Revolution
paragraph_text: Independent Ukraine and the Orange Revolution
  
  After the dissolution of the Soviet Union (USSR) in 1991, Ukraine and Russia maintained close ties. In 1994, Ukraine signed the Treaty on the Non-Proliferation of Nuclear Weapons and agreed to give up the former Soviet nuclear weapons in Ukraine. In return, Russia, the United Kingdom, and the United States agreed to uphold the territorial integrity and political independence of Ukraine through the Budapest Memorandum on Security Assurances. In 1999, Russia was one of the signatories of the Charter for European Security, which guaranteed the right of each state "to choose or change its security arrangements" and to join alliances if they wish. In the years after the dissolution of the USSR, several former Eastern Bloc countries joined NATO, partly in response to regional security threats involving Russia such as the 1993 Russian constitutional crisis, the War in Abkhazia (1992–1993) and the First Chechen War (1994–1996). Putin said Western powers broke promises not to let any Eastern European countries join.
  
  The 2004 Ukrainian presidential election was controversial. During the election campaign, opposition candidate Viktor Yushchenko was poisoned by TCDD dioxin; he later accused Russia of involvement. Viktor Yanukovych was declared the winner, despite allegations of vote-rigging by election observers. During a two-month period which became known as the Orange Revolution, large peaceful protests successfully challenged the outcome, and the Supreme Court of Ukraine annulled the result due to widespread electoral fraud. A re-run election was won by Yushchenko, leaving Yanukovych in opposition. The Orange Revolution is often grouped with other early-21st century protest movements within the former USSR, known as colour revolutions. According to Anthony Cordesman, Russian military officers viewed such colour revolutions as attempts by the US and European states to undermine Russia.