Nigeria striker Obafemi Martins has left Wolfsburg to join Russian champions Rubin Kazan, the latter announced on Saturday. Martins, 25, penned a three-year contract with the Kazan-based club. The pacey striker struggled to find a regular place with the Wolves last season as he played second fiddle to Edin Dzeko and Grafite. Martins was part of Nigeria's World Cup squad in South Africa.