s ▁with ▁Pacific ▁powers . ▁On ▁November ▁ 2 6 ▁in ▁Japan , ▁the ▁day ▁before ▁the ▁note ' s ▁delivery , ▁the ▁Japanese ▁task ▁force ▁left ▁port ▁for ▁Pear l ▁Har bor . ▁ ▁The ▁Japanese ▁intended ▁the ▁attack ▁as ▁a ▁prevent ive ▁action ▁to ▁keep ▁the ▁United ▁States ▁Pacific ▁Fle et ▁from ▁inter fer ing ▁with ▁its ▁planned ▁military ▁actions ▁in ▁S out heast ▁Asia ▁against ▁over se as ▁territ ories ▁of ▁the ▁United ▁Kingdom , ▁the ▁Netherlands , ▁and ▁the ▁United ▁States . ▁Over ▁the ▁course ▁of ▁seven ▁hours ▁there ▁were ▁coordin ated ▁Japanese ▁attacks ▁on ▁the ▁U . S .- h eld ▁Philippines , ▁Gu am ▁and ▁W ake ▁Island ▁and ▁on ▁the ▁British ▁Empire ▁in ▁Mal aya , ▁Singapore , ▁and ▁Hong ▁Kong . ▁ ▁Additionally , ▁from ▁the ▁Japanese ▁view point , ▁it ▁was ▁seen ▁as ▁a ▁pre empt ive ▁strike ▁' before ▁the ▁oil ▁gauge ▁ran ▁empty '. ▁ ▁Military ▁planning ▁Pre lim inary ▁planning ▁for ▁an ▁attack ▁on ▁Pear l ▁Har bor ▁to ▁protect ▁the ▁move ▁into ▁the ▁" S ou thern ▁Resource ▁Area " ▁( the ▁Japanese ▁term ▁for ▁the ▁Dutch ▁East ▁Ind ies ▁and ▁S out heast ▁Asia ▁generally ) ▁had ▁begun ▁very ▁early ▁in ▁ 1 9 4 1 ▁under ▁the ▁aus p ices ▁of ▁Admir al ▁Is or oku ▁Yam am oto , ▁then ▁command ing ▁Japan ' s ▁Com b ined ▁Fle et . ▁He ▁won ▁ass ent ▁to ▁formal ▁planning ▁and ▁training ▁for ▁an ▁attack ▁from ▁the ▁Imperial ▁Japanese