Apex domains cannot have CNAME records.
Question and response
Question
dig EVRO-TELECOM.RU. NS
Answer
evro-telecom.ru. 4 NS ns1.evro-telecom.ru.
evro-telecom.ru. 4 NS ns2.evro-telecom.ru.
Authority
The response has no authority records.
Additional
ns1.evro-telecom.ru. 4 A 46.8.104.4
ns2.evro-telecom.RU. 4 A 46.8.104.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0