Apex domains cannot have CNAME records.
Question and response
Question
dig runity.Ru. NS
Answer
runity.Ru. 4 NS cdnsa1.nic.Ru.
runity.Ru. 4 NS cdnsa2.nic.Ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0