kiev ukraine puzzle lack u.s. response request make question former donald trump campaign chief paul manafort witness two case involve misuse ukrainian state fund chief investigator say manafort indict last month washington charge deny range money launder act unregistered agent former pro-kremlin president viktor yanukovich party regions charge go back decade mention neither trump campaign serhii horbatiuk head special investigations general prosecutor office tell reuters ukraine send request 2014 2015 question representatives law firm manafort say ukraine receive reassurances federal bureau investigation fbi request would meet without result course normal horbatiuk say interview office would say upset would say officially upset clear say even result get far could get back 2015 2016 help years cooperation unknown reason washington fbi department immediately respond request reuters comment horbatiuk investigate two case one relate suspect illegal use ukrainian state fund justice ministry officials pay u.s. law firm report use justify imprisonment former prime minister political rival yulia tymoshenko yanukovich rule second relate so-called black ledger discover yanukovich 2014 ouster street protest book supposedly list payments slush fund yanukovich party regions associate include manafort yanukovich deny corruption accusations manafort deny wrongdoing ukraine stage want witness horbatiuk say contact assistance team special council robert mueller indict manafort investigation allege russian efforts swing 2016 presidential election trump favor manafort attorney say work ukrainians end 2014 two years join trump campaign indictment shed new light ukrainian case allegation manafort use offshore account funnel million pay tymoshenko report news horbatiuk team think report cost around million submit new request help u.s. within weeks important combine investigations obtain information determine origin money million say general information allow us say investigation could promise provide law enforcement agencies unite state ukraine cooperate interest manafort join trump presidential campaign march 2016 late become campaign manager force resign august question emerge previous work yanukovich party ukraine prosecutor say puzzle lack u.s. help manafort case