In Russia, the largest operator with ATR 42/72 is UTAir (and at least they bought 3 last atr 72-200 from finnair/aero) , their vacancies homepage is:
http://www.utair.ru/ru/about/vacancy/vacancy_pilot/
Warning, this is only in russian, so you may write or call them, but I dont know are they consider foreigners.
Have you tried Finncom? It operates in Finland and has great number of captain vacancies here, but you might give also try, they may consider to hire some non-finnish first-officers also.
http://www.fc.fi/jobs/
And besides sending the operators mails, I recommend you CALL the ATR operator's HR people and try to meet them, it works usually much better.