Apex domains cannot have CNAME records.
Question and response
Question
dig UNIPOL.RU. NS
Answer
UNIPOL.RU. 5 NS dns2.yandex.net.
UNIPOL.RU. 5 NS dns1.yandex.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0