Apex domains cannot have CNAME records.
Question and response
Question
dig ip-stream.ru. NS
Answer
ip-stream.ru. 2 NS ns1.ip-stream.ru.
ip-stream.ru. 2 NS ns2.ip-stream.ru.
Authority
The response has no authority records.
Additional
ns1.ip-stream.ru. 2 A 91.202.68.30
ns2.ip-stream.RU. 2 A 91.202.68.28
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0