Apex domains cannot have CNAME records.
Question and response
Question
dig merlin.net.ua. NS
Answer
merlin.net.ua. 4 NS ns3.merlin.net.ua.
merlin.net.ua. 4 NS ns2.merlin.net.ua.
merlin.net.ua. 4 NS ns.merlin.net.ua.
Authority
The response has no authority records.
Additional
ns.merlin.net.ua. 4 A 195.177.124.2
ns2.merlin.net.ua. 4 A 195.177.124.3
ns3.merlin.net.ua. 4 A 193.201.116.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0