berlin eu agreement britain relations brexit could serve model tie countries want close possible bloc yet ready join ukraine turkey germany foreign minister say britain secure go-ahead brussels start talk future relationship eu early month london say aspire close relationship former member third country interview funke newspaper group publish tuesday german foreign minister sigmar gabriel say deal could offer solution puzzle bloc 27 manage tie two large non-members imagine turkey ukraine become eu members next years say get smart agreement britain regulate relations europe brexit could model countries ukraine also turkey turkey candidate eu membership decades already customs union eu allow trade goods without tariff one possibility would offer ankara new close form customs union gabriel say although also say project would wait change turkey political environment thousands people include german citizens detain turkey part government crackdown since fail coup 2016. agreement eu ukraine deep comprehensive free trade area formally come force september aim allow free trade goods service capital visa-free travel people short stay ukraine desire close tie eu one drive force behind popular revolt topple pro-russian president 2014 lead moscow seize ukraine crimea peninsula back pro-russian separatists still-unresolved conflict east country gabriel social democratic party spd prepare talk chancellor angela merkel conservatives govern together another four years brexit deal could template eu tie ukraine turkey germany 's gabriel say