Question: what was the country of Tyumen in 1991-12-27
Paraphrase: On December 27, 1991, what country was Tyumen associated with?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q5815 p:P17 ?s . ?s ps:P17 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1991')) }