Apex domains cannot have CNAME records.
Question and response
Question
dig test1.ru. NS
Answer
test1.ru. 5 NS ns2.shop.reg.ru.
test1.ru. 5 NS ns1.shop.reg.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0