Apex domains cannot have CNAME records.
Question and response
Question
dig TEL.RU. NS
Answer
tel.ru. 2 NS ns2.tel.ru.
tel.ru. 2 NS ns.tel.ru.
Authority
The response has no authority records.
Additional
ns.tel.ru. 2 A 87.249.5.150
ns2.tel.ru. 2 A 87.249.6.74
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0