Kozachenko. Moved from Ukraine to Argentina 1925/1940
I am looking for the part of my family that moved from Ukraine to Argentina between 1925 and 1940. My grandmother's uncle with a surname Kozachenko. By that time he was about 30/40 y.o. Unfortunately no other information available as my grandmother was born in 1928 and she is the oldest alive member of the family but she does not remember much as in USSR any contacts with people from abroad were dangerous so all the documents, birth certificates etc were destroyed by the remaining in the USSR family for security reasons.
So if you know anything, please let me know.
Thanks in advance