I don't know yet but Oleg Tsariov has withdrawn based on, clearly the message sent execution style of Kharkiv's Mayor and how Kiev's failure to offer an equal access to the media's for all candidates had the potential to lead to the withdrawal of the South Eastern candidates which will prove to be a mistake if the election scheduled in May takes place but no surprise for now. Even if the security situation doesn't allow the candidates with a Russian speaking background to campaign in the entire country, no candidate may create a negative vacuum for the South Eastern communities,  a negative for the South Eastern communities interests creating a moral vacuum hard liners will quickly exploit, may be.