Former Ukrainian Prime Minister Yulia Tymoshenko, delivers her speech, during the Batkivshchina (Fatherland) party congress in Kiev, Ukraine, Saturday, March 29, 2014. Tymoshenko, declared this week that she will "be the candidate of Ukrainian unity." The May 25 election is taking place against the backdrop of the annexation of Crimea, Ukraine's dire economic straits and rumblings of discontent in the country's mainly Russian-speaking eastern provinces. (AP Photo/Efrem Lukatsky)

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko waves at the audience during a convention in Kiev on March 29, 2014. Ukraine's controversial opposition leader, Yulia Tymoshenko, has formally joined the race to become the country's president, on the same day as the huge task facing the new leadership was underscored by a tough IMF aid package that will foist deep austerity on the country. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko waves at the audience during a convention in Kiev on March 29, 2014. Ukraine's controversial opposition leader, Yulia Tymoshenko, has formally joined the race to become the country's president, on the same day as the huge task facing the new leadership was underscored by a tough IMF aid package that will foist deep austerity on the country. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko waves at the audience during a convention in Kiev on March 29, 2014. Ukraine's controversial opposition leader, Yulia Tymoshenko, has formally joined the race to become the country's president, on the same day as the huge task facing the new leadership was underscored by a tough IMF aid package that will foist deep austerity on the country. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko delivers a speech during a convention in Kiev on March 29, 2014. Ukraine's controversial opposition leader, Yulia Tymoshenko, has formally joined the race to become the country's president, on the same day as the huge task facing the new leadership was underscored by a tough IMF aid package that will foist deep austerity on the country. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko delivers a speech during a convention in Kiev on March 29, 2014. Ukraine's controversial opposition leader, Yulia Tymoshenko, has formally joined the race to become the country's president, on the same day as the huge task facing the new leadership was underscored by a tough IMF aid package that will foist deep austerity on the country. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko delivers a speech during a convention in Kiev on March 29, 2014. Ukraine's controversial opposition leader, Yulia Tymoshenko, has formally joined the race to become the country's president, on the same day as the huge task facing the new leadership was underscored by a tough IMF aid package that will foist deep austerity on the country. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko delivers a speech during a convention in Kiev on March 29, 2014. Ukraine's controversial opposition leader, Yulia Tymoshenko, has formally joined the race to become the country's president, on the same day as the huge task facing the new leadership was underscored by a tough IMF aid package that will foist deep austerity on the country. AFP PHOTO/GENYA SAVILOV

Former Ukrainian Prime Minister Yulia Tymoshenko delivers a speech during the Batkivshchyna (Fatherland) party congress in Kiev, Ukraine, Saturday, March 29, 2014. Tymoshenko, declared this week that she will "be the candidate of Ukrainian unity." The May 25 election is taking place against the backdrop of the annexation of Crimea, Ukraine's dire economic straits and rumblings of discontent in the country's mainly Russian-speaking eastern provinces. (AP Photo/Efrem Lukatsky)

Former Ukrainian Prime Minister Yulia Tymoshenko, right, delivers a speech alongside a supporter during the Batkivshchyna (Fatherland) party congress in Kiev, Ukraine, Saturday, March 29, 2014. Tymoshenko, declared this week that she will "be the candidate of Ukrainian unity." The May 25 election is taking place against the backdrop of the annexation of Crimea, Ukraine's dire economic straits and rumblings of discontent in the country's mainly Russian-speaking eastern provinces. (AP Photo/Efrem Lukatsky)

Former Ukrainian Prime Minister Yulia Tymoshenko, speaks during press conference in Kiev, Ukraine, Thursday, March 27, 2014. Tymoshenko has announced on Thursday she will run for presidential elections set for May 25. Tymoshenko, who was released from jail last month following the overthrow of President Viktor Yanukovcyh, said Thursday that she has earned the moral right to say she will combat corruption. (AP Photo/Sergei Chuzavkov)

Former Ukrainian Prime Minister Yulia Tymoshenko, speaks during press conference in Kiev, Ukraine, Thursday, March 27, 2014. Tymoshenko has announced on Thursday she will run for presidential elections set for May 25. Tymoshenko, who was released from jail last month following the overthrow of President Viktor Yanukovcyh, said Thursday that she has earned the moral right to say she will combat corruption. (AP Photo/Sergei Chuzavkov), APTOPIX

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko speaks during a press conference in Kiev on March 27, 2014. Ukraine's divisive opposition icon Yulia Tymoshenko completed an improbable return to politics on March 27 by confirming plans to run for president in elections on May 25. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko speaks during a press conference in Kiev on March 27, 2014. Ukraine's divisive opposition icon Yulia Tymoshenko completed an improbable return to politics on March 27 by confirming plans to run for president in elections on May 25. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko smiles during a press conference in Kiev on March 27, 2014. Ukraine's formerly jailed divisive opposition icon Yulia Tymoshenko completed an improbable return to politics on March 27 after her release on February 22 by confirming plans to run for president in elections on May 25. AFP PHOTO/GENYA SAVILOV

Former Ukrainian prime minister and opposition leader Yulia Tymoshenko speaks during a press conference in Kiev on March 27, 2014. Ukraine's formerly jailed divisive opposition icon Yulia Tymoshenko completed an improbable return to politics on March 27 following her release on February 22, by confirming plans to run for president in elections on May 25. AFP PHOTO/GENYA SAVILOV

Yulia Tymoshenko, leader of Batkivshchyna (Ukraine), speaks to delegates at the European People's Election Congress in Dublin, Ireland, Thursday, March 6, 2014. Dublin is currently hosting the European People's Party Elections Congress. (AP Photo/Peter Morrison)

Yulia Tymoshenko, Leader of Ukraine's Batkivshchyna Party, addresses delegates at the Dublin Convention Centre in Dublin, Ireland, on March 6, 2014. Up to 2,000 delegates arrive in Dublin Thursday for the start of the European People's Party (EPP) conference, where the party will vote for its preferred candidate to succeed Jose Manuel Barroso as President of the European Commission. AFP PHOTO / PETER MUHLY

Yulia Tymoshenko, leader of Batkivshchyna (Ukraine) waits to speak at the European People's Election Congress in Dublin, Ireland, Thursday, March 6, 2014. Dublin is currently hosting the European People's Party Elections Congress. (AP Photo/Peter Morrison)

Yulia Tymoshenko, leader of Ukraine's Batkivshchyna Party, addresses the media during a press conference at the European People's Party (EPP) Congress at the Dublin Convention Centre in Dublin, Ireland, on March 6, 2014. Up to 2,000 delegates arrive in Dublin Thursday for the start of the European People's Party (EPP) conference, where the party will vote for its preferred candidate to succeed Jose Manuel Barroso as President of the European Commission. AFP PHOTO / PETER MUHLY