Thank you very much Eugenia for all this information. In another forum I received tremendous assistance from Hannia and others who started to put me on the right direction for researching my Jakob.
Hannia and her friends contacted also a village maire in Ukraine who was kind enough to visit a small community of interest (Seleznivka) but sadly this was a dead end for me.
I feel like you about a strong link between all these Jakob names and Melentiy. Somehow and very subjectively I feel that the one who went to Kazakhstan is mine... In addition to the church men you name, there is also more names in the following link: http://www.yatran.com.ua/articles/98.htmlhttp://www.yatran.com.ua/articles/98.html
Note that I cannot read cyrillic, I use tools such as Google Translation to try to understand the text.
I have written to the authorities in Kazakhstan and they kindly replied that they do not have these files because they are in Moscou. So I emailed the relevant Russian authorities and never got a reply. I have also emailed the church authorities in Kiev (I think the links you provide, I need to verify this) and they also did not reply. I emailed the archives in Rivne and they replied that after searching their holdings they did not have the information requested. I also contacted the German authorities to find out if Jakob may have been a prisoner of war and eventually they replied to say that they did not have information on him.
I am currently compiling a detailed summary of the evidence I found on the Chizhskiy who were in the orthodox church and when ready I will try the church again. It is tedious, slow and laborious. Somehow the church somewhere in Ukraine or Russia must have the answer we are looking for so long.