Question: when did the soviets declared war on japan
[{'answer': 'August 9 , 1945', 'provenance': [{'wikipedia_id': '4891298', 'title': 'Soviet–Japanese War', 'start_paragraph_id': 5, 'start_character': 321, 'end_paragraph_id': 5, 'end_character': 336, 'bleu_score': 1.0, 'section': 'Section::::Summary.\n'}]}, {'provenance': [{'wikipedia_id': '4891298', 'title': 'Soviet–Japanese War', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 799, 'bleu_score': 0.8902593923907681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8705533131377152678}, 'section': 'Section::::Abstract.'}]}]