19 – The US and the USSR agree to end production of chemical weapons and to destroy most of their stockpiles of chemical weapons. May 20 – Cold War: The first post-Communist presidential and parliamentary elections are held in Romania. May 21 – In Kashmir, a Kashmiri Islamic leader is assassinated and Indian security forces open fire on mourners carrying his body, killing at least 47 people. May 22 Cold War: The leaders of the Yemen Arab Republic and the People's Democratic Republic of Yemen announce the unification of their countries as the Republic of Yemen. May 27 In the Burmese general election, Burma's first multiparty election in 30 years, the National League for Democracy led by Aung San Suu Kyi wins in a landslide, but the State Law and Order Restoration Council nullifies the election results. In the Colombian presidential election, César Gaviria is elected President of Colombia; he takes office on August 7. May 29 Mikhail Gorbachev arrives in Ottawa for a 29-hour visit. Boris Yeltsin is elected as the first ever elected president of the Russian Soviet Federative Socialist Republic. European Bank for Reconstruction and Development (EBRD) founded. May 30 – George H. W. Bush and Mikhail Gorbachev begin a four-day summit meeting in Washington, D.C. June June – Joanne Rowling gets the idea for Harry Potter while on a train from Manchester to London Euston railway station. She begins writing Harry Potter and the Philosopher's Stone which will be completed in 1995 and published in 1997. June 1 Cold War: U.S. President George H. W. Bush and Soviet President Mikhail Gorbachev sign a treaty to end chemical weapon production and begin destroying their respective stocks. Members of the Provisional Irish Republican Army shoot and kill Major Michael Dillon-Lee and Private William Robert Davies of the British Army. Dillon-Lee is killed outside his home in Dortmund, Germany and Davies is killed at a railway station in Lichfield, England. June 2 – The Lower Ohio Valley tornado outbreak spawns 88 confirmed tornadoes in Illinois, Indiana, Kentucky, and Ohio, killing 12; 37 tornadoes occur in Indiana, eclipsing the previous record of 21 during the Super Outbreak of April 1974. June 4 – Violence breaks out in the Kirghiz SSR between the majority Kyrgyz people and minority Uzbeks over the distribution of homestead land. June 7 Metropolitan Alexy of Leningrad is elected Russian Orthodox Patriarch of Moscow and all Rus'.