dublin ireland threaten use veto brexit talk stage lack progress irish border dublin strong position eu member state behind prime minister leo varadkar say sunday brussels want three issue broadly solve decide december whether talk move second phase trade exit bill safeguard expatriate right border ireland northern ireland uk land frontier eu departure late round negotiations week ireland say still way go two team border move trade raise possibility dublin could block side advance satisfy question much hypothetical one know ireland outstanding issue december go stage go make ultimatums threaten use veto varadkar tell irish national broadcaster rte one thing manage 18 months since brexit referendum totally align 27 member state berlin bucharest behind us put us strong position irish government call britain simply promise hard border return northern ireland 1998 peace deal separate military checkpoints due 30 years sectarian violence british province varadkar say friday best way achieve maintain regulations side border add amount demand part uk remain eu customs union varadkar sound positive note early week say likely enough progress would make december 14-15 summit eu leaders give green light think december deadline meet think possible move phase two talk want tell ireland newstalk radio station separate interview sunday sort phase one issue particular ireland sort december go new year ireland threaten veto brexit talk 'at stage pm say