NEW : Rebel Prime Minister wins in self-proclaimed Luhansk . Russian Foreign Ministry considers the vote valid . Exit polls show a half million people voted in People 's Republic of Donetsk . The Western government and Ukrainian countries have criticized the elections .
NEW : Rebel Prime Minister wins in self-proclaimed People 's Republic of Donetsk . Russian Foreign Ministry considers the vote valid . Exit polls show more than 500,000 people voted in Luhansk . The Ukrainian government and Western countries have criticized the elections .