, ▁during ▁Rus so - J apan ese ▁War , ▁Hart ing ▁was ▁sent ▁on ▁an ▁assignment ▁not ▁directly ▁related ▁to ▁revolution ary ▁activities . ▁He ▁was ▁to ▁organ ise ▁a ▁surve ill ance ▁of ▁possible ▁Japanese ▁sp ies ▁in ▁the ▁Balt ic , ▁in ▁order ▁to ▁prevent ▁dis ru ptions ▁to ▁the ▁navigation ▁of ▁Russian ▁fleet ▁to ▁the ▁Pacific . ▁ ▁Chief ▁of ▁Paris ▁Ok h ran a ▁ ▁After ▁the ▁assass ination ▁of ▁Inter ior ▁Minister ▁V y aches lav ▁von ▁Ple h ve ▁and ▁the ▁es cal ation ▁of ▁revolution ary ▁activity ▁in ▁ 1 9 0 5 , ▁Rach kov sky ▁was ▁brought ▁back ▁into ▁Ok h ran a ▁as ▁a ▁deput y ▁head ▁of ▁the ▁Police ▁Department , ▁and ▁soon ▁after ▁arranged ▁to ▁have ▁R ata ev ▁replaced ▁with ▁Hart ing ▁as ▁chief ▁of ▁Paris ▁Ok h ran a . ▁Under ▁Hart ing , ▁Paris ▁Ok h ran a ▁reached ▁the ▁peak ▁of ▁its ▁activity . ▁Hart ing ' s ▁operations ▁were ▁particularly ▁effective ▁against ▁arms ▁sm ugg ling ▁into ▁Russia ▁by ▁revolution ary ▁groups . ▁Hart ing ▁coordin ated ▁surve ill ance ▁and ▁pen etr ation ▁of ▁these ▁groups ▁throughout ▁Europe , ▁and ▁introduced ▁the ▁fil ing ▁system ▁with ▁information ▁about ▁all ▁persons ▁mentioned ▁in ▁intelligence ▁and ▁oper ational ▁reports . ▁He ▁coordin ated ▁a ▁network ▁of ▁about ▁ 4 0 ▁pen etr ation ▁agents ▁and ▁about ▁ 2 0 ▁external ▁surve ill ance ▁agents . ▁ ▁Ex pos ure ▁ ▁In ▁ 1 9 0 9