Apex domains cannot have CNAME records.
Question and response
Question
dig samaralan.ru. NS
Answer
samaralan.ru. 5 NS ns2.samaralan.ru.
samaralan.ru. 5 NS ns1.samaralan.ru.
Authority
The response has no authority records.
Additional
ns1.samaralan.ru. 5 A 85.236.160.1
ns2.samaralan.ru. 5 A 85.236.161.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0