The European champions play their Iberian neighbours in the 2014 Winter Olympics host city Sochi in the opening match for both nations Friday.
The top two teams from each group qualify for the last 16.
The Spaniards arrived at their own base in the southern Russian city of Krasnodar on Thursday.
It will be the team's seventh World Cup appearance and the 33-year-old Ronaldo's fourth and likely last campaign.
Their best result saw them finish third in 1966.
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