Apex domains cannot have CNAME records.
Question and response
Question
dig uea.km.ua. NS
Answer
uea.km.ua. 5 NS ns37.inhostedns.org.
uea.km.ua. 5 NS ns27.inhostedns.net.
uea.km.ua. 5 NS ns17.inhostedns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0