Database: olympics
Question: Who is the heaviest athlete from Russia?
SQL: SELECT T3.full_name FROM noc_region AS T1 INNER JOIN person_region AS T2 ON T1.id = T2.region_id INNER JOIN person AS T3 ON T2.person_id = T3.id WHERE T1.region_name = 'Russia' ORDER BY T3.weight DESC LIMIT 1