Apex domains cannot have CNAME records.
Question and response
Question
dig citiparts.ru. NS
Answer
citiparts.ru. 5 NS ns1.citiparts.ru.
citiparts.ru. 5 NS ns2.citiparts.ru.
Authority
The response has no authority records.
Additional
ns1.citiparts.ru. 5 A 79.137.226.20
ns2.citiparts.ru. 5 A 79.137.226.20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0