Question: What peace treaties have the Soviet Union signed?
Paraphrase: What peace arrangements have the Soviet Union marked?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P710 wd:Q15180 . ?sbj wdt:P31 wd:Q625298 } 
Answer: Treaty on the Final Settlement with Respect to Germany, Paris Peace Treaties, Moscow Peace Treaty, Moscow Armistice