nice france russian businessman lawmaker suleiman kerimov arrest french police nice airport monday even connection tax evasion case official french prosecutor office say tuesday kerimov rank forbes magazine russia 21st wealthy businessman net worth 6.3 billion family control russia large gold producer polyus hold question case relate launder tax fraud proceed official say representatives kerimov could immediately reach comment polyus decline comment source say investigation center purchase several luxury residences french riviera via shell company something would enable kerimov reduce tax owe french state source add kerimov would hold custody least another 24 hours russia foreign ministry say statement carry interfax news agency kerimov hold diplomatic passport immunity say inform french authorities kerimov diplomatic passport protect prosecution french official say french foreign ministry could immediately confirm contact moscow french diplomatic source say immunity give governments people diplomatic list mandate specific mission country russian lawmaker kerimov detain french police tax evasion case