Apex domains cannot have CNAME records.
Question and response
Question
dig REDHAM.RU. NS
Answer
REDHAM.RU. 4 NS ns2.REDHAM.RU.
REDHAM.RU. 4 NS ns1.REDHAM.RU.
Authority
The response has no authority records.
Additional
ns1.REDHAM.RU. 4 A 91.226.82.88
ns2.REDHAM.RU. 4 A 80.87.111.213
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0