Ukraine's former Prime Minister Yulia Tymoshenko says her faction is withdrawing from the ruling coalition in parliament.

Tymoshenko's move Wednesday comes a day after Prime Minister Arseniy Yatsenyuk's cabinet survived a no-confidence vote in parliament even though a majority of lawmakers declared its work unsatisfactory. The failure to pass the motion reflected lawmakers' fears that it could lead to the collapse of the ruling coalition and early elections.

Tymoshenko, who leads the smallest of the four factions in the coalition, said it has become an obstacle to reforms.

Before the vote, President Petro Poroshenko urged Yatsenyuk to resign, but many members of Poroshenko's faction refrained from voting for the Cabinet's dismissal.

Poroshenko and Yatsenyuk lead the largest factions in the coalition. They retain a majority despite Tymoshenko's exit.