I would have no idea how to contact or communicate with these people!
Write a letter in English, using simple sentences, which will be easier for them to translate.
A little later I will set up the mailing addresses for you, which you will copy and paste on the envelops.
Kyiv is a pretty cosmopolitan city. Many people are well-educated and multilingual. Don't worry about it all that much. You haven't gotten a response yet. When you get a response, you will deal w/it.
"Where there is a will, there is always a way."
I only found the surname Segal. I will go back double check for Segalsky.