▁the ▁Add itional ▁Secret ▁Pro tocol ▁( sup ers eded ▁by ▁a ▁similar ▁subsequent ▁secret ▁protocol , ▁the ▁German - S ov iet ▁Front ier ▁Tre aty , ▁the ▁next ▁month ) ▁car ved ▁up ▁spher es ▁of ▁influence ▁in ▁Eastern ▁Europe ▁between ▁Naz i ▁Germany ▁and ▁the ▁Soviet ▁Union , ▁placing ▁Finland , ▁Est onia , ▁Lat via , ▁B ess arab ia ▁( part ▁of ▁Roman ia ), ▁and ▁eastern ▁Poland ▁in ▁the ▁Soviet ▁sphere , ▁and ▁western ▁Poland ▁and ▁Lith u ania ▁in ▁the ▁German ▁sphere . ▁The ▁existence ▁of ▁the ▁secret ▁protocol ▁was ▁not ▁revealed ▁until ▁ 1 9 8 9 ; ▁when ▁it ▁became ▁public , ▁it ▁caused ▁out rage ▁in ▁the ▁Balt ic ▁states . David ▁J . ▁Smith ▁et ▁al ., ▁The ▁Balt ic ▁States : ▁Est onia , ▁Lat via ▁and ▁Lith u ania ▁( Rout ledge , ▁ 2 0 0 2 ), ▁pp . ▁ 4 4 - 4 5 . ▁ ▁The ▁percent ages ▁agreement ▁was ▁a ▁secret ▁p act ▁between ▁Soviet ▁Premier ▁Joseph ▁St alin ▁and ▁British ▁Prime ▁Minister ▁W inst on ▁Church ill ▁during ▁the ▁Four th ▁Moscow ▁Conference ▁on ▁, ▁about ▁how ▁to ▁divide ▁various ▁European ▁countries ▁among ▁ ▁the ▁leader ' s ▁respective ▁spher es ▁of ▁influence . ▁The ▁agreement ▁was ▁officially ▁made ▁public ▁by ▁Church ill ▁twelve ▁years ▁later ▁in ▁the ▁final ▁volume ▁of ▁his ▁mem oir ▁of ▁the ▁Second ▁World ▁War . ▁ ▁Dec line ▁in ▁modern ▁times ▁After ▁World ▁War ▁II , ▁the ▁registration ▁system