Kiev (AFP) - Ukraine voters will go to the polls Sunday in elections set to dramatically reshape parliament, after a year of upheavals in which a deadly pro-Russian uprising has threatened to splinter the ex-Soviet state.Campaigning ended on Friday for the polls called by President Petro Poroshenko in August.Poroshenko is under pressure to purge parliament of lawmakers tied to the old regime of Viktor Yanukovych, ousted in February after a wave of bloody protests.While Poroshenko may succeed in creating a pro-Western coalition in parliament, he is falling short of his other aim of bringing the separatist east under control and out of the reach of an increasingly assertive Kremlin.Russian President Vladimir Putin -- accused of stirring up the uprising after seizing Crimea in the wake of his ally's ouster in Kiev -- said he respected Ukraine's territorial integrity but questioned how its frontier with Russia was set. "The history of Ukraine's formation and its current borders -- this is a rather complex process," Putin said in the Black Sea resort of Sochi.Putin highlighted Moscow's involvement in Ukraine's affairs when he acknowledged for the first time that Russia had helped Yanukovych flee his country following his ouster."I won't hide the fact that we helped him seek refuge in Crimea.