Apex domains cannot have CNAME records.
Question and response
Question
dig c2free.ru. NS
Answer
c2free.ru. 5 NS camilo.ns.cloudflare.com.
c2free.ru. 5 NS molly.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0