Apex domains cannot have CNAME records.
Question and response
Question
dig dnepro.net. NS
Answer
dnepro.net. 5 NS ns4.dnepro.net.
dnepro.net. 5 NS ns.secondary.net.ua.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0