Who was the last premier of the Soviet Union?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q15180', 'id': 0, 'label': 'Soviet Union'}, {'type': 'INTERNAL', 'name_': 'Q199500', 'id': 1, 'label': 'Gyumri'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q132856', 'id': 2, 'label': 'Armenian Soviet Socialist Republic'}], 'links': [{'name_': 'P17', 'source': 1, 'target': 0, 'label': 'country'}, {'name_': 'P131', 'source': 1, 'target': 2, 'label': 'located in the administrative territorial entity'}]}