brussels european union chief brexit negotiator say thursday worry britain plan border arrangement ireland leave eu urge london come creative proposals comment michel barnier highlight gulf two side one tricky issue throw brexit affect currently seamless movement people goods republic ireland eu member british-ruled northern ireland britain say last month border post immigration check along 500 km 300 mile frontier brexit 30,000 people make cross day businesses farm brew depend easy movement goods north south brussels dublin also say want keep open border say britain fail explain would square state intention leave eu customs union see uk paper ireland northern ireland worry barnier tell news conference brussels uk want eu suspend application laws customs union single market new external border eu uk want use ireland kind test case future eu-uk customs relations happen barnier say eu also concern britain could use border two irelands way circumvent tariff could impose post-brexit eu-uk trade deal barnier remark coincide publication set principles european commission eu executive irish issue deal explicitly state onus propose solutions ireland fell britain paper also make clear hard border ireland northern ireland avoid protect peace island say physical border infrastructure rule require flexible imaginative solutions nearly three months brexit talk eu britain negotiators make little progress irish border issue expatriate citizens right bill london pay eu partner settle exist financial commitments brussels want broadly solve talk future trade relationship start irish government call britain make substantive commitments provide workable solutions prime minister leo varadkar reiterate side achieve aim avoid hard border britain need stay customs union similar arrangement least post-brexit transition phase britain seize eu comment need open border evidence british eu objectives closely align particular commitment avoid physical infrastructure border important step forward government spokesman say add position paper side clearly provide good basis continue make swift progress eu 's barnier worry uk 's post-brexit plan irish border