Apex domains cannot have CNAME records.
Question and response
Question
dig AVTLG.RU. NS
Answer
AVTLG.RU. 3 NS adns1.south.rt.RU.
AVTLG.RU. 3 NS adns2.south.rt.RU.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0