Apex domains cannot have CNAME records.
Question and response
Question
dig redham.RU. NS
Answer
redham.RU. 5 NS ns1.redham.RU.
redham.RU. 5 NS ns2.redham.RU.
Authority
The response has no authority records.
Additional
ns1.redham.RU. 5 A 91.226.82.88
ns2.redham.RU. 5 A 80.87.111.213
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0