MADRID (Reuters) -A Spanish soccer fan who returned to Spain on Tuesday after spending more than a year detained by the Iranian authorities on espionage charges told reporters at the airport he was already planning his return to the Islamic Republic. Santiago Sanchez, who set out to walk to the Qatar World Cup from Spain, entered Iran on his way and was detained after visiting and photographing the burial site of Mahsa Amini, a 22-year-old Kurdish woman who was arrested for allegedly flouting mandatory dress code and died in custody. The Iranian embassy in Madrid announced his release on New Y…