Apex domains cannot have CNAME records.
Question and response
Question
dig QUANTUMART.RU. NS
Answer
QUANTUMART.RU. 5 NS ns02.qdns.RU.
QUANTUMART.RU. 5 NS ns01.qdns.RU.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0