In the years since the Euromaidan uprising, political and economic integration with the European Union have become a cornerstone of the administration led by Ukrainian President Petro Poroshenko and Prime Minister Volodymyr Groysman. Poroshenko came to power in 2014 after President Viktor Yanukovich was deposed following months of protest inspired by his refusal to sign a trade agreement with the European Union. As one of his first acts in office, Poroshenko began negotiations to revive the agreement that his predecessor had rejected, and EU accession has been a primary goal for his government ever since. Now, the uncertainty created by the United Kingdom's vote to leave the European Union has thrown Ukraine's future in the bloc -- and the legitimacy of the government in Kiev -- into doubt....