Apex domains cannot have CNAME records.
Question and response
Question
dig mostelekom.net. NS
Answer
mostelekom.net. 4 NS ns1.ncnet.ru.
mostelekom.net. 4 NS ns2.ncnet.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0