Apex domains cannot have CNAME records.
Question and response
Question
dig GOSUSLUGI.RU. NS
Answer
GOSUSLUGI.RU. 5 NS ns2.GOSUSLUGI.RU.
GOSUSLUGI.RU. 5 NS ns8-l2.nic.RU.
GOSUSLUGI.RU. 5 NS ns1.GOSUSLUGI.RU.
GOSUSLUGI.RU. 5 NS ns4-l2.nic.RU.
Authority
The response has no authority records.
Additional
ns1.GOSUSLUGI.RU. 5 A 213.59.253.4
ns2.GOSUSLUGI.RU. 5 A 213.59.255.175
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0