What is the nation of the speedway league where Ikaros Smederna played?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Ikaros_Smederna> <http://dbpedia.org/ontology/league> ?x . ?x <http://dbpedia.org/ontology/country> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/SpeedwayLeague>}
Ikaros_Smederna