My family is also from Zvenigorodka. I was recently contacted by some relatives who have been living in the States since the 1970's. They have little information since they left ZV and grew up in Kiev. I've been in touch with a genealogist to find out exactly how we are related, because the surname is the same, "Koshevetsky." 
Myrna Simon
missmyrna31@gmail. com
Newport Beach, CA