Under [[1. japansk-kinesiske krig]] erobrede Japan øen Taiwan og Diaoyu-øerne, som formelt tilfaldt Japan i [[1895]]. Efter [[2. verdenskrig]] blev området besat af [[USA]], som forvaltede øerne frem til [[1972]], da de blev tilbagegivet til Japan. Diaoyu-øernes tilhørsforhold til Japan blev aldrig imødegået under den amerikanske besættelse. <ref>[http://books.google.co.jp/books?id=MZGsi1ptLvoC&pg=PA10&redir_esc=y#v=onepage&q&f=false Seokwoo Lee: "Territorial Disputes among Japan, China and Taiwan concerning the Senkaku Islands" (''Boundary & Territory Briefing'' Vol.3 No.7); IBRU]; {{ISBN|1-897643-50-0}}; s. 10-11 (citat: "''For a long time following the entry into force of the San Francisco Peace Treaty China/Taiwan raised no objection to the fact that the Senkaku Islands were included in the area placed under US administration in accordance with the provisions of Article of the treaty, and USCAP No. 27. In fact, neither China nor Taiwan had taken up the question of sovereignty over the islands until the latter half of 1970 when evidence relating to the existence of oil resources deposited in the East China Sea surfaced. All this clearly indicates that China/Taiwan had not regarded the Senkaku Islands as a part of Taiwan. Thus, for Japan, none of the alleged historical, geographical and geological arguments set forth by China/Taiwan are acceptable as valid under international law to substantiate China's territorial claim over the Senkaku Islands.''")</ref>
Jura Folkeret Mellemmenneskelige_forhold