Apex domains cannot have CNAME records.
Question and response
Question
dig infocom.km.ua. NS
Answer
infocom.km.ua. 5 NS ns2.ic.km.ua.
infocom.km.ua. 5 NS ns.ic.km.ua.
infocom.km.ua. 5 NS ns2.colocall.net.
Authority
The response has no authority records.
Additional
ns.ic.km.ua. 5 A 78.152.160.5
ns2.colocall.net. 5 A 216.66.94.157
ns.ic.km.ua. 5 AAAA 2a00:6740:0:0:0:0:0:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0