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