Apex domains cannot have CNAME records.
Question and response
Question
dig NCNET.RU. NS
Answer
ncnet.ru. 5 NS nsmt.rt.ru.
ncnet.ru. 5 NS ns2mt.rt.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0