Apex domains cannot have CNAME records.
Question and response
Question
dig BSNDSY.RU. NS
Answer
BSNDSY.RU. 4 NS ns194b.iprojects.RU.
BSNDSY.RU. 4 NS ns195b.iprojects.RU.
BSNDSY.RU. 4 NS ns194a.iprojects.RU.
BSNDSY.RU. 4 NS ns195a.iprojects.RU.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0