Apex domains cannot have CNAME records.
Question and response
Question
dig VMTS.RU. NS
Answer
vmts.ru. 4 NS ns.vmts.ru.
vmts.ru. 4 NS ns.vlad.ru.
Authority
The response has no authority records.
Additional
ns.vlad.ru. 4 A 212.107.200.68
ns.vmts.ru. 4 A 212.122.1.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0