Apex domains cannot have CNAME records.
Question and response
Question
dig CITTEL.RU. NS
Answer
cittel.ru. 5 NS ns.cittel.ru.
cittel.ru. 5 NS ns0.cittel.ru.
Authority
The response has no authority records.
Additional
ns.CITTEL.RU. 5 A 89.207.94.34
ns0.CITTEL.RU. 5 A 89.207.95.18
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0