Apex domains cannot have CNAME records.
Question and response
Question
dig SSNDSY.RU. NS
Answer
ssndsy.ru. 5 NS ns195a.iprojects.ru.
ssndsy.ru. 5 NS ns195b.iprojects.ru.
ssndsy.ru. 5 NS ns194a.iprojects.ru.
ssndsy.ru. 5 NS ns194b.iprojects.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0