Apex domains cannot have CNAME records.
Question and response
Question
dig MOSCOMNET.RU. NS
Answer
moscomnet.ru. 2 NS ns1.moscomnet.ru.
moscomnet.ru. 2 NS ns2.moscomnet.ru.
Authority
The response has no authority records.
Additional
ns1.MOSCOMNET.RU. 2 A 185.221.164.250
ns2.MOSCOMNET.RU. 2 A 185.221.165.250
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0