Al Jazeera reports pro-Russian separatists in Ukraine's eastern region of Donetsk have announced the end of a ceasefire, ending a period of relative calm as the country braces for parliamentary polls. Addressing reporters on Thursday, the prime minister of the self-proclaimed Donetsk People’s Republic, Alexander Zakharchenko, said "The truce has been observed by us alone. But the day before yesterday we started to respond as well. It has been quieter since yesterday." He added that self-defence forces are planning to retake the cities of Slavyansk, Kramatorsk and Mariupol, while Kiev prepares for legislative polls scheduled for Sunday. Meanwhile, Ukrainian Prime Minister Arseny Yatseniuk warned of possible attempts by Russia to destabilise the parliamentary election and ordered security to be boosted to prevent "terrorist acts" being carried out.