Apex domains cannot have CNAME records.
Question and response
Question
dig mchost.com. NS
Answer
mchost.com. 2 NS dns2.mchost.com.
mchost.com. 2 NS dns1.mchost.ru.
Authority
The response has no authority records.
Additional
dns1.mchost.ru. 2 A 87.98.134.16
dns1.mchost.ru. 2 A 178.250.247.60
dns2.mchost.com. 2 A 46.254.23.53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0