Apex domains cannot have CNAME records.
Question and response
Question
dig cONNect.Spb.RU. NS
Answer
CONneCT.SpB.Ru. 2 NS ns1.connect.spb.ru.
CONneCT.SpB.Ru. 2 NS ns2.connect.spb.ru.
Authority
The response has no authority records.
Additional
ns1.connect.spb.ru. 2 A 188.134.6.132
ns2.CONneCT.SpB.Ru. 2 A 146.66.181.162
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0