Hungary's plans to import and possibly use Russia's touted Sputnik V COVID-19 vaccine raise safety concerns and could damage trust in potential shots, the European Commission said, opening a new front in the EU's fraught relations with Budapest.Hungarian Prime Minister Viktor Orban's hard line against migration and what critics say is his increasingly authoritarian grip on power - an accusation he has repeatedly denied - as well as his pursuit of close relations with Russia have caused repeated clashes with the European Union.A new showdown is expected on Thursday when EU leaders hold a video conference that may address the bloc's massive COVID rescue plan and seven-year budget, which Hungary and Poland's nationalist governments are.