Apex domains cannot have CNAME records.
Question and response
Question
dig kemsu.ru. NS
Answer
kemsu.ru. 4 NS ns.kemsu.ru.
kemsu.ru. 4 NS dist.kemsu.ru.
kemsu.ru. 4 NS ns2.kemsu.ru.
Authority
The response has no authority records.
Additional
ns.kemsu.ru. 4 A 82.179.1.1
ns2.kemsu.ru. 4 A 82.179.1.5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0