Czechs in Ukraine Mostly, they were women with ethnic Ukrainian husbands. Some others stayed of their own choice. During the Soviet era, they were one of the most affected groups by the Chernobyl nuclear power plant disaster in 1986. At the end of the 1980s, ten thousand Czechs lived in Ukraine. At the beginning of the 90s Czechoslovakia invited these remaining Czechs to return to the Czech Republic, which in 1993 almost 2,000 people did, and other people came to the Czech Republic in later years. As of today, Volhynian Czechs are still migrating. In 2014, after the revolution in Ukraine and the
Nuclear weapons and Ukraine territorial integrity of Ukraine. Despite Russia's claimed annexation of Crimea, which the UN General Assembly rejected as invalid, the Government of Ukraine in 2014 reaffirmed its 1994 decision to accede to the Nuclear Non-Proliferation Treaty as a non-nuclear-weapon state. After the Ukrainian Parliament voted to remove President Viktor Yanukovych from office, a power vacuum formed, and Russia annexed Crimea. The Russian pretext used nationalist and cultural rhetoric, claiming that the Russian military was protecting ethnic Russians from attack in Crimea and Eastern Ukraine. Russia's military actions violated the Budapest Memorandum. Pavlo Rizanenko, a member of the Ukrainian parliament told "USA