Apex domains cannot have CNAME records.
Question and response
Question
dig vf-ua.com. NS
Answer
vf-ua.com. 5 NS ns1.vf-ua.org.
vf-ua.com. 5 NS ns2.vf-ua.org.
vf-ua.com. 5 NS ns.vegatele.com.
Authority
The response has no authority records.
Additional
ns.vegatele.com. 5 A 195.248.191.70
ns1.vf-ua.org. 5 A 88.214.81.30
ns2.vf-ua.org. 5 A 88.214.94.30
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0