Apex domains cannot have CNAME records.
Question and response
Question
dig MYSAFECITY.RU. NS
Answer
MYSAFECITY.RU. 5 NS ns2.podolsknet.RU.
MYSAFECITY.RU. 5 NS ns1.podolsknet.RU.
Authority
The response has no authority records.
Additional
ns1.podolsknet.ru. 5 A 109.94.0.3
ns2.podolsknet.ru. 5 A 109.94.1.30
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0