Apex domains cannot have CNAME records.
Question and response
Question
dig politzk-ru.org. NS
Answer
politzk-ru.org. 5 NS ns1.politzk-ru.org.
politzk-ru.org. 5 NS ns2.politzk-ru.org.
Authority
The response has no authority records.
Additional
ns1.politzk-ru.org. 5 A 86.111.188.92
ns2.politzk-ru.org. 5 A 185.9.157.51
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0