Did {Korean_War} {participant} {Netherlands}?
Was Netherlands in the Korean War?
Did Netherlands participate in Korean War?
ASK WHERE { resource:Korean_War property:participant resource:Netherlands }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q8663> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P710> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q55>. } 
ASK WHERE { wd:Q8663 wdt:P710 wd:Q55 }