Question: who seized ukraine and belarus to form the soviet union
[{'answer': 'Józef Piłsudski', 'provenance': [{'wikipedia_id': '84329', 'title': 'History of Soviet Russia and the Soviet Union (1917–27)', 'start_paragraph_id': 18, 'start_character': 269, 'end_paragraph_id': 18, 'end_character': 284, 'bleu_score': 1.0, 'section': 'Section::::Polish–Soviet War.\n'}]}, {'provenance': [{'wikipedia_id': '84329', 'title': 'History of Soviet Russia and the Soviet Union (1917–27)', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 856, 'bleu_score': 0.9854535765681661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9153824877257875099}, 'section': 'Section::::Polish–Soviet War.\n'}]}]