Apex domains cannot have CNAME records.
Question and response
Question
dig RCPOD.RU. NS
Answer
rcpod.ru. 5 NS ns.rcpod.ru.
rcpod.ru. 5 NS ns.pc-net.ru.
Authority
The response has no authority records.
Additional
ns.rcpod.ru. 5 A 80.69.184.161
ns.pc-net.ru. 5 A 212.164.86.69
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0