WARSAW (AFP) - European Union leaders have expressed their concerns to Ukraine over the trial of former premier Yulia Tymoshenko, which they consider "a serious matter", EU president Herman Van Rompuy said Friday. Speaking at the close of a summit between the 27 EU leaders and ex-Soviet states, including Ukraine, Van Rompuy said: "We expressed our concerns about the fate of the former prime minister and we expressed our rejection of the possible selective use of judicial measures against members of the former administration."