Progressive Socialist Party
In the run-up to the 2010 presidential election the Progressive Socialist Party of Ukraine refused to join the Bloc of Left and Center-left Forces since it did not want to be in the same election bloc as the Socialist Party of Ukraine. Instead the party tried to nominate Natalia Vitrenko again as their candidate in that election but the Central Election Commission of Ukraine refused to register her for failure to pay the required 2.5 million hryvnya nomination deposit. Eventually the Progressive Socialist Party of Ukraine supported Party of Regions leader Viktor Yanukovych in the runoff of the 2010 presidential election.