Apex domains cannot have CNAME records.
Question and response
Question
dig rembez.ru. NS
Answer
rembez.ru. 3 NS ns2.rembez.ru.
rembez.ru. 3 NS ns1.rembez.ru.
Authority
The response has no authority records.
Additional
ns1.rembez.ru. 3 A 185.169.107.38
ns2.rembez.ru. 3 A 50.114.74.149
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0