Apex domains cannot have CNAME records.
Question and response
Question
dig vital-ter.com.ua. NS
Answer
vital-ter.com.ua. 5 NS ns25.inhostedns.net.
vital-ter.com.ua. 5 NS ns35.inhostedns.org.
vital-ter.com.ua. 5 NS ns15.inhostedns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0