Question: when was the lend lease act extended to the soviet union
[{'answer': '1941', 'provenance': [{'wikipedia_id': '55832', 'title': 'Lend-Lease', 'start_paragraph_id': 1, 'start_character': 319, 'end_paragraph_id': 1, 'end_character': 323, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]