Apex domains cannot have CNAME records.
Question and response
Question
dig lan.ua. NS
Answer
lan.ua. 5 NS nsa1.srv53.com.
lan.ua. 5 NS nsd4.srv53.org.
lan.ua. 5 NS nsa3.srv53.org.
lan.ua. 5 NS nsb1.srv53.org.
lan.ua. 5 NS nsc4.srv53.org.
lan.ua. 5 NS nsd4.srv53.com.
lan.ua. 5 NS nsc2.srv53.com.
lan.ua. 5 NS nsc2.srv53.net.
lan.ua. 5 NS nsb3.srv53.net.
lan.ua. 5 NS nsd2.srv53.net.
lan.ua. 5 NS nsb4.srv53.com.
lan.ua. 5 NS nsa1.srv53.net.
Authority
The response has no authority records.
Additional
nsa1.srv53.com. 5 A 178.32.247.7
nsa1.srv53.net. 5 A 5.39.10.94
nsb1.srv53.org. 5 A 135.181.9.149
nsa1.srv53.com. 5 AAAA 2001:41d0:203:dee4:178:32:247:7
nsa1.srv53.net. 5 AAAA 2001:41d0:203:dee4:5:39:10:94
nsb1.srv53.org. 5 AAAA 2a01:4f9:4a:530c:181:9:149:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0