bogota colombia president juan manuel santos tuesday name gustavo bell government chief negotiator peace talk marxist eln rebel say government work toward extend ceasefire insurgent group bell vice president president andres pastrana 1998 2002 currently ambassador cuba replace juan camilo restrepo guide talk national liberation army eln since begin february santos say televise address government hop extend ceasefire begin october end jan. 9. eln first time achieve stoppage hostilities perfect positive work toward improve extend january santos say eln sunday say will continue ceasefire sufficient progress peace talk say would assess government willingness overcome hurdle eln government negotiations quito 10 months long secret exploratory phase bid end 53 years war santos leave office next year sign peace accord late 2016 revolutionary arm force colombia farc become political party hop fight government ballot box eln first-ever ceasefire supervise roman catholic church unite nations 2,000-strong eln regularly bomb oil infrastructure take hostages continue kidnap despite ceasefire indigenous leader choco province die october take group colombia name new peace negotiator eln seek ceasefire extension