washington trump administration wednesday impose sanction two senior south sudanese officials country former army chief warn government president salva kiir increase attack civilians country four-year civil war u.s. treasury department statement website say blacklist malek reuben riak rengu deputy chief defense logistics south sudan army paul malong former army chief sack kiir may minister information michael makuei lueth roles destabilize south sudan measure freeze assets unite state tie u.s. financial system belong three men mawien makol spokesman south sudan foreign affairs ministry call washington announcement unfortunate sanction undermine efforts rather help efforts makol say refer 2015 peace deal nathaniel oyet senior official opposition spla-io group welcome move although add come bite late want yesterday give us confidence donald trump administration fix crisis south sudan say oyet u.s. crackdown come days trump new aid administrator mark green visit south sudan deliver blunt message kiir washington review policy toward government call kiir end violence implement real ceasefire meet signal trump administration reconsider back kiir come power support washington oil-rich south sudan independence neighbor sudan 2011 follow decades conflict world young country dissolve civil war 2013 kiir ethnic dinka fire deputy riek machar nuer nearly one-third country population million people flee home create continent large refugee crisis since 1994 rwandan genocide statement u.s. treasury say malek reuben central weapons procurement first years conflict help plan offensive unity state april 2015 target civilians lead numerous right abuse also accuse issue military contract inflate price order receive extensive kickbacks u.s. treasury blacklist energy investments a+ engineer electronics media print mak international service say own control malek reuben malong sack kiir may army chief put house arrest capital juba country defense minister tell reuters last week u.s. treasury say sanction obstruct peace talk international peacekeeping efforts humanitarian missions south sudan treasury statement say malong reportedly responsible efforts kill machar 2016 discourage kill civilians around town wau last year say malong find currency worth millions u.s. dollars possession belong military treasury try flee juba early may reach phone nairobi malong wife ayak lucy tell reuters husband financial assets unite state unaware sanction announcement meanwhile u.s. treasury accuse makuei attack u.n. mission south sudan obstruct peacekeeping humanitarian missions country call economic sanction property america world tell reuters response sanction trump administration blacklist three officials south sudan war