Redmine

Unable to complete migration from Mantis db. After applying patch #3608 I've got the following message:

Please enter settings for your Mantis database
adapter [mysql]:
host [localhost]:
database [bugtracker]: basename
username [root]:
password []: pass
encoding [utf8]:
data encoding [UTF-8]:

Migrating users.......rake aborted!
Mysql::Error: #HY000Incorrect string value: '\xD0' for column 'lastname' at row 1: INSERT INTO `users` (`status`, `created_on`, `last_login_on`, `hashed_password`, `language`, `updated_on`, `admin`, `type`, `firstname`, `lastname`, `mail`, `mail_notification`, `auth_source_id`, `login`) VALUES(1, '2009-08-25 03:22:34', '2009-08-21 21:08:33', '82f2923433d3a47d10af450058e8642c5a4c022d', '', '2009-08-25 03:22:34', 0, NULL, '╨Ъ╤Г╨╖╨╜╨╡╤Ж╨╛╨▓', '╨б╨╡╤А╨│╨╡╨╣ ╨Р╨╜╨░╤В╨╛╨╗╤М╨╡╨', 'mail@gmail.com', 0, NULL, 'Smoker')
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:147:in `log'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb:302:in `execute'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:161:in `insert_sql'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb:312:in `insert_sql'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:44:in `insert_without_query_dirty'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:19:in `insert'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/base.rb:2517:in `create_without_callbacks'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/callbacks.rb:220:in `create_without_timestamps'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/timestamp.rb:29:in `create'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/base.rb:2483:in `create_or_update_without_callbacks'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/callbacks.rb:207:in `create_or_update'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/base.rb:2217:in `save_without_validation!'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/validations.rb:921:in `save_without_dirty!'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/dirty.rb:83:in `save_without_transactions!'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/transactions.rb:110:in `save!'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:66:in `transaction'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/transactions.rb:79:in `transaction'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/transactions.rb:98:in `transaction'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/transactions.rb:110:in `save!'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/transactions.rb:118:in `rollback_active_record_state!'
C:/rails/redmine-0.8.4/vendor/rails/activerecord/lib/active_record/transactions.rb:110:in `save!'
C:/rails/redmine-0.8.4/lib/tasks/migrate_from_mantis.rake:260:in `migrate'
C:/rails/redmine-0.8.4/lib/tasks/migrate_from_mantis.rake:251:in `each'
C:/rails/redmine-0.8.4/lib/tasks/migrate_from_mantis.rake:251:in `migrate'
C:/rails/redmine-0.8.4/lib/tasks/migrate_from_mantis.rake:509
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
C:/Ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
C:/Ruby/bin/rake:19:in `load'
C:/Ruby/bin/rake:19

Could you help me reslove this issue?
All tables have utf8 codepage with utf8_general_ci collation.
Connection encodning set to utf8 in database.yml.
Mantis db contains Russian characters.
When I try to set data encoding to latin1 or cp1251 migration complete ok but all russian characters becomes unreadable.