Question: Name the Russian mixed martial artist who currently fights in the lightweight division of the UFC and is a training partner of Natalia Vitalyevna Vorobieva, a Russian wrestler who competed in the 2012 Summer Olympics?
{'answer': 'Islam Makhachev', 'supporting_facts': [['Natalia Vorobieva', 0], ['Natalia Vorobieva', 4], ['Islam Makhachev', 0]]}