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