Apex domains cannot have CNAME records.
Question and response
Question
dig net35.ru. NS
Answer
net35.ru. 5 NS ns1.net35.ru.
net35.ru. 5 NS ns2.net35.ru.
Authority
The response has no authority records.
Additional
ns1.net35.ru. 5 A 91.237.144.2
ns2.net35.ru. 5 A 195.14.100.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0