Yulia Tymoshenko, the former prime minister of Ukraine who was released from jail last month after her arch-foe Viktor Yanukovych fled from power, has confirmed she will again run for president in an election on May 25.

Former Ukrainian prime minister Yulia Tymoshenko has announced she will stand in presidential elections set for May 25.

The freed political prisoner who has become one of the symbols of the Ukrainian revolution has said Europe must act to repel Russian aggression.

Ukraine was plunged into new uncertainty after a deadly political standoff — as a top opposition figure assumed presidential powers.

Yulia Tymoshenko, Ukraine’s ex-premier freed as the tide turned against her nemesis, president Viktor Yanukovych, is a steely and telegenic figure hailed by the opposition, but also a polarising one dogged by suspicions of personal enrichment and opportunism.