Apex domains cannot have CNAME records.
Question and response
Question
dig redo.ua. NS
Answer
redo.ua. 3 NS chuck.ns.cloudflare.com.
redo.ua. 3 NS tess.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0