Apex domains cannot have CNAME records.
Question and response
Question
dig starlink.ua. NS
Answer
starlink.ua. 5 NS carl.ns.cloudflare.com.
starlink.ua. 5 NS rita.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0