lviv ukraine day force way past border guard back ukraine former georgian president mikheil saakashvili say would unite opposition former ally president petro poroshenko plan campaign support saakashvili want unseat poroshenko next election accuse president renege promise root corruption carry reform make 2014 maidan protest oust pro-kremlin leader present seem unlikely saakashvili study ukraine speak fluent ukrainian come power ukrainian citizenship bestow poroshenko make governor odessa 2015 withdraw poll show little support party movement new force fight rampant corruption fact oligarchs full control ukraine fact maidan betray saakashvili say press conference city lviv saakashvili divide opinion supporters see fearless crusader corruption critics say little substance behind blustery rhetoric back home georgia time office tarnish critics say monopolize power exert pressure judiciary president time disastrous five-day war russia 2008 conflict critics argue result miscalculations saakashvili say covet presidency want promote new young politician post perhaps threat direct rival saakashvili could prove effective weapon poroshenko powerful opposition figure like yulia tymoshenko border sunday poroshenko trail poll behind tymoshenko former prime minister leader one ukraine large opposition party marriage convenience tymoshenko saakashvili party different interest say political analyst volodymyr fesenko try use situation hope provoke political crisis ukraine lead early elections saakashvili relationship poroshenko date back nearly three decades students university kiev share opposition kremlin late bring together politicians bitter spat erupt november 2016 year poroshenko invite saakashvili governor region odessa help drive reform latter quit accuse poroshenko abet corruption turn one loud critics meanwhile poroshenko office say saakashvili fail deliver change governor say ukrainian citizenship withdraw allegedly put false information registration form saakashvili say decision politically motivate leave effectively stateless georgia also withdraw citizenship sunday even saakashvili supporters force way past cordon border guard return ukraine poland matter violate state border invaders east politicians west always must legal responsibility poroshenko say televise remark monday president say saakashvili use ukrainian court challenge revocation matter law enforcement agencies begin act poroshenko say saakashvili say would travel regions ukraine unite different political force around common theme must democracy let oligarchs hold sway ukraine record implement reform patchy since poroshenko take office 2014. reformist lawmaker mustafa nayyem one face maidan protest member poroshenko faction parliament travel saakashvili sunday accuse kiev authorities try silence opponents want country stay maidan tell reporters want country opponents political opponents right say want saakashvili may yet face arrest police launch criminal investigation sunday incident general prosecutor yuriy lutsenko say cross border illegally would prosecute kiev could leave saakashvili alone arrest possibly extradite georgia saakashvili take power georgia peaceful uprise know rise revolution 2003 49-year-old want criminal charge georgia say trump political reason saakashvili plan unite ukraine opposition president