ns2.FR.RU has no NS records.
NS records for this zone are defined at FR.RU.
NS records for this zone are defined at FR.RU.
Question and response
Question
dig ns2.FR.RU. NS
Answer
The response has no answer records.
Authority
FR.RU. 300 SOA ns1.FR.RU. internet.action-media.RU. 1310476200 14400 180 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0