The deputy leader of Bloc of Yulia Tymoshenko faction, Andriy Portnov, has said that the union of his political force with the Party of Regions is highly improbable.

He told this to Interfax-Ukraine while commenting on Party of Regions' MP Andriy Kliuyev statement about a possibility of the Party of Regions and the BYT's joint voting of in parliament for the completion of the constitutional reform.

"I believe that such union is impossible today in connection with the upcoming presidential elections and the insufficient responsibility of certain candidates for presidency," Kliuyev said.

At the same time, he said that the union of the BYT and the Party of Regions could be possible after the presidential elections, depending on their outcome.