How to convert JSON to CSV? (with UTF-8 support)

Earlier there was a question How can I convert JSON to CSV? and there were lots of answers, however none of them explains how to convert non-latin1 data.

Let's say I have a JSON file like the following:

[
    {"id":123,"FullName":"Иванов Иван Иванович"},
    {"id":124,"FullName":"Петров Петр Петрович"}
]

And I try to use a script like that:

#!/usr/bin/env python2.7
# -*- coding: utf-8 -*-

import sys
import codecs
import json
import unicodecsv as csv

if __name__ == '__main__':
    fin = codecs.open(sys.argv[1], encoding='utf-8')
    data = json.load(fin)
    fin.close()

    with codecs.open('test.csv', encoding='utf-8', mode='wb') as csv_file:
        w = csv.writer(csv_file, encoding='utf-8')
        w.writerow(data[0].keys())  # header row

        for row in data:
            w.writerow(row.values())

Which gives me the following error:

UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 32: ordinal not in range(128)

First of all it is not clear what is there at position 32, but the most interesting question is if there is a way to save UTF-8 encoded strings to CSV file.

from How to convert JSON to CSV? (with UTF-8 support)