tallinn years bail greece idea let poor state euro zone spark controversy particularly germany chancellor angela merkel seek re-election two weeks time backlash come european commission president jean-claude juncker call wednesday non-euro zone countries quickly adopt single currency european union find new unity euro britain leave 2019. juncker promise propose technical financial help will quickly trigger concern influential german members european parliament like deputy chairman economic committee markus ferber juncker call interpret germany mean commission would lenient assess readiness single currency mostly former communist poor eastern european countries like bulgaria romania greece adopt euro 2001 late turn ready falsify deficit statistics country trigger massive debt crisis euro zone bail three time euro zone governments euro eu countries clear criteria rule join greece repeat ferber tweet juncker speech eu officials become concern misread juncker speech germany could fuel support populist eurosceptic party juncker aid take twitter friday try counter effect stress countries would allow single currency meet economic governance criteria german language-only tweet also point like keen would-be member bulgaria already meet many though economic standards entry adopt euro european union country low inflation interest rat debt deficit within eu limit well stable exchange rate prove two years spend exchange rate mechanism ii without severe tensions exchange rate bulgarian lev absolutely stable euro since 2006 juncker head cabinet martin selmayr tweet inflation rate bulgaria 0.2 pct much low euro area address german sensitivity debt tweet german debt almost 66 pct gdp twice high bulgarian one romania bulgaria meet nominal criteria join euro except two-year exchange rate stability test erm ii compatibility central bank laws euro zone requirements also far meet soft criterion real economic convergence euro zone economies factor could prevent get go-ahead adopt euro countries outside euro zone include bulgaria croatia czech republic hungary poland romania sweden denmark britain last two formal opt-out join others legal obligation adopt euro meet criteria deadlines commission vice president valdis dombrovskis say bulgaria express clear desire join euro zone romania express similar sentiment big wealthy non-euro members eu like sweden poland czech republic hungary plan adopt currency foreseeable future prefer keep economic flexibility provide control exchange rate euro zone enlargement call spark backlash germany