Former Ukrainian Prime Minister Yulia Tymoshenko address supporters during campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid. Opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Former Ukrainian Prime Minister Yulia Tymoshenko addresses supporters during campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid. Opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Former Ukrainian Prime Minister Yulia Tymoshenko waves to supporters during campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid. Opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Former Ukrainian Prime Minister Yulia Tymoshenko, center, with Ukrainian army veterans attend a campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid. Opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Former Ukrainian Prime Minister Yulia Tymoshenko addresses supporters during campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid. Opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Supporters of former Ukrainian Prime Minister Yulia Tymoshenko listen as she addresses the large crowd during a campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid and opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Supporters of former Ukrainian Prime Minister Yulia Tymoshenko listen as she addresses the large crowd during a campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid and opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Former Ukrainian President Leonid Kravchuk addresses to supporters of former Ukrainian Prime Minister Yulia Tymoshenko during a campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid and opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Former Ukrainian Prime Minister Yulia Tymoshenko addresses supporters during campaign rally in Kiev, Ukraine, Tuesday, Jan. 22, 2019. Tymoshenko has announced her presidential bid, and opinion polls have placed the 58-year-old, who was the country's prime minister between 2007 and 2010, as a front-runner in the presidential election set for March 31. (AP Photo/Efrem Lukatsky)

Yulia Tymoshenko greets veterans of the armed conflict with Russia-backed rebels in the east of Ukraine during a congress of her Batkivshchyna (Fatherland) party in Kiev on January 22, 2019. - Former Ukrainian prime minister Yulia Tymoshenko on January 22, 2019, officially launched her bid for the presidency, with polls showing her as the frontrunner for the country's top political post. Tymoshenko has been a leading figure on the Ukrainian political scene for the last two decades, coming to international prominence through her role in the 2004 Orange Revolution. (Photo by Genya SAVILOV / AFP)