Apex domains cannot have CNAME records.
Question and response
Question
dig lts.org.ua. NS
Answer
lts.org.ua. 2 NS ns2.zahid.host.
lts.org.ua. 2 NS ns3.zahid.host.
lts.org.ua. 2 NS ns4.zahid.host.
lts.org.ua. 2 NS ns1.zahid.host.
Authority
The response has no authority records.
Additional
ns1.zahid.host. 3 A 159.69.182.136
ns2.zahid.host. 3 A 161.35.117.60
ns3.zahid.host. 3 A 95.216.172.227
ns4.zahid.host. 3 A 77.123.155.17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0