ພາບຫຼ້າສຸດ ຈາກ ຢູເຄຣນ

Ukrainian businessman, politician and presidential candidate Petro Poroshenko (L) meets supporters during his election campaign in Odessa May 21, 2014. REUTERS/Mykola Lazarenko/Pool (UKRAINE - Tags: BUSINESS POLITICS ELECTIONS) - RTR3Q6BH

Local residents walk with their young children in a park in Donetsk, Ukraine, on Wednesday, May 21, 2014. Ukraine are hold a presidential election on Sunday(AP Photo/Evgeniy Maloletka)

Workers stand near pipes at a gas compressor station near Uzhhorod May 21, 2014. Russia has said state-controlled exporter Gazprom will not supply transit nation Ukraine with gas for its own use in June if Kiev fails to pay in advance and has warned a cut

Ukrainian businessman, politician and presidential candidate Petro Poroshenko (R) meets supporters during his election campaign in Odessa May 21, 2014. REUTERS/Mykola Lazarenko/Pool (UKRAINE - Tags: POLITICS ELECTIONS BUSINESS) - RTR3Q6BD

Former Ukrainian prime minister and current presidential candidate Yulia Tymoshenko (L) visits a hospital during her election campaign in the city of Sumy May 21, 2014. Campaigning for Ukraine's presidential election, Tymoshenko says she alone can save th