Apex domains cannot have CNAME records.
Question and response
Question
dig HNET.RU. NS
Answer
hnet.RU. 1 NS ns5.nsk.ru.
hnet.RU. 1 NS ns2.nsk.ru.
hnet.RU. 1 NS ns.nsk.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0