Ukrainian oligarch Mykola Zlochevsky founds Burisma, an energy company.
June:: Hunter Biden co-founds Rosemont Seneca Partners, with Christopher Heinz (the stepson of John Kerry and heir to the Heinz fortune) and Devon Archer, who had been friends with Heinz at Yale. 
February 7, 2010: Viktor Yanukovych elected president of Ukraine.
In an apparent conflict of interest, Burisma founder Mykola Zlochevsky serves as a minister of ecology and finance under President Yanukovich. His term ends in 2012.
November 2013: Political revolution in Ukraine. Tens of thousands protest the government of President Yanukovych. His reluctance to join the European Union is a major point of contention. 
Sometime in 2014: An investigation begins into Burisma founder Zlochevsky for tax violations, money-laundering and self-dealing via his ministry position. The government quickly shutters the inquiry, however.
February 2014: The pro-Russian Ukrainian Yanukovytch government falls. His security forces crack down on the demonstrators killing more than 70 civilians and spurring a political backlash. Yanukovych flees to Russia.
March-April 2014: Russian forces invade Crimea and declare the annexation of the peninsula, starting a war that continues today and has killed more than 14,000 people. 
April 2014: Hunter Biden, son of Vice President Joe Biden, is appointed to a five-year term on the Burisma board of directors. According to Reuters, board meetings were held outside Ukraine, and Hunter Biden never visited the country. Reuters also says Biden assisted with analysis of oil and gas assets the company was considering buying abroad.