Apex domains cannot have CNAME records.
Question and response
Question
dig la.net.ua. NS
Answer
la.net.ua. 5 NS ns2.lanet.ua.
la.net.ua. 5 NS ns1.lanet.ua.
la.net.ua. 5 NS ns3.lanet.ua.
Authority
The response has no authority records.
Additional
ns1.lanet.ua. 5 A 194.50.85.40
ns2.lanet.ua. 5 A 91.212.203.17
ns3.lanet.ua. 5 A 213.169.83.65
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0