Apex domains cannot have CNAME records.
Question and response
Question
dig KMV.RU. NS
Answer
kmv.ru. 5 NS orion.kmv.ru.
kmv.ru. 5 NS ns.kmv.ru.
kmv.ru. 5 NS ns1.kmv.ru.
Authority
The response has no authority records.
Additional
ns.KMV.RU. 5 A 217.13.212.40
ns1.KMV.RU. 5 A 217.13.213.158
orion.KMV.RU. 5 A 212.193.62.128
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0