Apex domains cannot have CNAME records.
Question and response
Question
dig vpsville.ru. NS
Answer
vpsville.ru. 5 NS ns2.vpsville.ru.
vpsville.ru. 5 NS ns1.vpsville.ru.
Authority
The response has no authority records.
Additional
ns1.VPSVILLE.RU. 5 A 185.220.32.103
ns2.VPSVILLE.RU. 5 A 5.9.191.179
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0