Apex domains cannot have CNAME records.
Question and response
Question
dig BORZENKOV.RU. NS
Answer
BORZENKOV.RU. 5 NS ns1.spaceweb.RU.
BORZENKOV.RU. 5 NS ns4.spaceweb.pro.
BORZENKOV.RU. 5 NS ns3.spaceweb.pro.
BORZENKOV.RU. 5 NS ns2.spaceweb.RU.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0