Apex domains cannot have CNAME records.
Question and response
Question
dig abctel.ru. NS
Answer
abctel.ru. 5 NS ns11.hoster.ru.
abctel.ru. 5 NS ns10.hoster.ru.
Authority
The response has no authority records.
Additional
ns10.HOSTER.ru. 5 A 195.128.50.221
ns11.hoster.RU. 5 A 31.28.20.108
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0