Apex domains cannot have CNAME records.
Question and response
Question
dig org.ua. NS
Answer
org.ua. 5 NS ns.dn.ua.
org.ua. 5 NS ba1.ns.ua.
org.ua. 5 NS cz.ns.ua.
org.ua. 5 NS rcz.ns.ua.
org.ua. 5 NS ho1.ns.org.ua.
org.ua. 5 NS nn.ns.ua.
Authority
The response has no authority records.
Additional
cz.ns.ua. 172710 A 185.43.134.15
nn.ns.ua. 172710 A 194.58.197.4
ho1.ns.org.ua. 5 A 195.47.253.10
rcz.ns.ua. 172234 A 193.46.128.10
cz.ns.ua. 172710 AAAA 2001:148f:fffd:0:0:0:0:15
nn.ns.ua. 172710 AAAA 2a01:3f1:c001:0:0:0:0:53
ho1.ns.org.ua. 5 AAAA 2001:67c:258:0:0:0:0:10
rcz.ns.ua. 172234 AAAA 2a02:850:ffe0:0:0:0:0:10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0