I found an interesting map which shows candidates’ support by polling stations. 
As you can see, Yuri Boyko seems to have won the East, that is the Donetsk and Lugansk regions under the control of Ukraine. This is very much in line with the findings of the Kyiv International Institute of Sociology, which suggests a rather high approval of the leadership in Russia by people of Eastern Ukraine. Boyko’s most visible pre-election move was a visit to Moscow, together with Viktor Medvedchuk.
The areas of support for Poroshenko might be due to military presence in the area. Otherwise, Poroshenko’s games with language and religion, and his declared pro-Western course have won in hearts and minds in Western regions. Outside of the Lvov region, a competition with Tymoshenko is apparent.
Otherwise, the Central, Southern regions, Transcarpathia, Bukovina were overwhelmingly claimed by Zelenskiy. The latter has a real chance of winning the election.
Insomniac Resurrected 
He only got less than 40% in Lvov also. That’s a rubbish result. Crucially , he lost comfortably in Kiev.
I wouldn’t trust the KIIS either. He’s clearly fixed the results,the distance between Poroshenko and Tymoshenko or Poroshenko and Boiko is easily within the margin of error to not believe they actually got beaten by him. Boiko wasn’t that far behind Zelensky in Odessa. Though it’s important to remember that whilst some pro-Russian voters supported him- he actually isn’t that much pro-Russian, he’s very much part of the PoR set that betrayed Russia before, and plenty of pro-Russian voters realised it.
All being said ,15% vote for nominally pro-Russian parties, with 10-12% in the DNR/LNR territories , and another 10% of Ukrainians in Russia not allowed to vote – that leaves a serious impression.
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