Apex domains cannot have CNAME records.
Question and response
Question
dig orange-business.ru. NS
Answer
orange-business.ru. 5 NS ns2.rosprint.net.
orange-business.ru. 5 NS ns1.rosprint.net.
Authority
The response has no authority records.
Additional
ns1.rosprint.net. 5 A 185.128.196.254
ns2.rosprint.net. 5 A 194.84.23.125
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0