what is the {start time} for {Kharkiv} has {country} as {Ukrainian People's Republic} ?
From what date was Kharkiv part of the country Ukraine?
SELECT ?value WHERE { wd:Q42308 p:P17 ?s . ?s ps:P17 wd:Q243610 . ?s pq:P580 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q42308> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P17> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q243610> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

When was Kharkiv assimilated into Ukraine?