ns.OBCITY.RU has no CNAME records.
Question and response
Question
dig ns.OBCITY.RU. NS
Answer
The response has no answer records.
Authority
obcity.ru. 4281 SOA ns.obcity.ru. ns1.obcity.ru. 2012020920 43200 3600 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0