Apex domains cannot have CNAME records.
Question and response
Question
dig spets-proekt.spb.ru. NS
Answer
spets-proekt.spb.ru. 4 NS ns34-cloud.nic.ru.
spets-proekt.spb.ru. 4 NS ns3-l3.nic.ru.
spets-proekt.spb.ru. 4 NS ns4-l3.nic.ru.
spets-proekt.spb.ru. 4 NS ns8-l3.nic.ru.
spets-proekt.spb.ru. 4 NS ns38-cloud.nic.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0