Apex domains cannot have CNAME records.
Question and response
Question
dig ORTEL.RU. NS
Answer
ortel.ru. 5 NS dns.ortel.ru.
ortel.ru. 5 NS ns.ortel.ru.
Authority
The response has no authority records.
Additional
ns.ortel.ru. 5 A 195.208.14.6
dns.ortel.ru. 5 A 195.208.8.170
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0