Apex domains cannot have CNAME records.
Question and response
Question
dig lealta.ru. NS
Answer
lealta.ru. 4 NS ns2.tut.net.
lealta.ru. 4 NS ns1.tut.net.
Authority
The response has no authority records.
Additional
ns1.tut.net. 4 A 95.131.144.34
ns2.tut.net. 4 A 89.207.216.74
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0