Apex domains cannot have CNAME records.
Question and response
Question
dig utels.ua. NS
Answer
utels.ua. 5 NS vicky.ns.cloudflare.com.
utels.ua. 5 NS mary.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
mary.ns.cloudflare.com. 1 A 108.162.192.134
mary.ns.cloudflare.com. 1 A 172.64.32.134
mary.ns.cloudflare.com. 1 A 173.245.58.134
vicky.ns.cloudflare.com. 1 A 108.162.195.69
vicky.ns.cloudflare.com. 1 A 162.159.44.69
vicky.ns.cloudflare.com. 1 A 172.64.35.69
mary.ns.cloudflare.com. 1 AAAA 2606:4700:50:0:0:0:adf5:3a86
mary.ns.cloudflare.com. 1 AAAA 2803:f800:50:0:0:0:6ca2:c086
mary.ns.cloudflare.com. 1 AAAA 2a06:98c1:50:0:0:0:ac40:2086
vicky.ns.cloudflare.com. 1 AAAA 2606:4700:58:0:0:0:a29f:2c45
vicky.ns.cloudflare.com. 1 AAAA 2803:f800:50:0:0:0:6ca2:c345
vicky.ns.cloudflare.com. 1 AAAA 2a06:98c1:50:0:0:0:ac40:2345
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0