Oracle Forms

I am reading and parsing lines from csv file. It works fine, but there is a problem: when the text inside the string is written in Russian(Cyrillic) forms write them as ???. When I try to open csv with excel or notepad it however displays correctly. How can I solve this issue?

I read and parse lines like follows

Client_Text_IO.Get_Line ( input_file, linebuffer );
     
     create_record;    
     v_array := apex_util.string_to_table(linebuffer, ';');
   for i in 1..v_array.count
   loop    
      dbms_output.put_line(v_array(i));
end loop;