Problem storing Russian Characters in Oracle 10g

We are facing an issue in one of our sites which is in Russian Language. Whenever data is submitted with Russian Characters it saves it as Question mark(upside down) in the database. Database is not supporting these characters.The character encoding is done in UTF-8 format from the front end.
This code use to work fine with Oracle 9i database but after the upgradation to Oracle 10g this problem has started occuring. We have not made any changes to the code after the upgradation of the database.
How can we resolve this and what are the settings that we can do to make this work fine?

What is your database character set and national character set?
SELECT *
  FROM v$nls_parameters
WHERE parameter like '%CHARACTERSET';Are you storing the data in CHAR/ VARCHAR2/ CLOB columns? Or NCHAR/ NVARCHAR2/ NCLOB?
Justin

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