Apex domains cannot have CNAME records.
Question and response
Question
dig UGMK-TELECOM.RU. NS
Answer
UGMK-TELECOM.RU. 5 NS ns1.UGMK-TELECOM.RU.
UGMK-TELECOM.RU. 5 NS ns2.UGMK-TELECOM.RU.
Authority
The response has no authority records.
Additional
ns1.UGMK-TELECOM.RU. 5 A 89.251.66.7
ns2.UGMK-TELECOM.RU. 5 A 89.251.79.5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0