By Manuel Ausloos and Luiza Ilie CONSTANTA, Romania (Reuters) – President Emmanuel Macron voiced a tougher line on Russia on Wednesday after visiting French and allied troops at a NATO base in Romania, seeking to assuage concerns in Ukraine and among some European allies over his previous stance towards Moscow. Macron arrived in Romania on Tuesday for a three-day trip to NATO’s southern flank including Moldova before possibly heading to Kyiv on Thursday on a visit with German Chancellor Olaf Scholz and Italian Prime Minister Mario Draghi, two diplomatic sources said. The French leader has been…