Apex domains cannot have CNAME records.
Question and response
Question
dig TTEL.ru. NS
Answer
ttel.ru. 4 NS dns1.mts.ru.
ttel.ru. 4 NS dns0.mts.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0