BRUSSELS — Former Dutch Defense Minister Kajsa Ollongren has been appointed secretary general of the European External Action Service, the EU’s foreign policy wing. The move, announced in an email to staff on Wednesday afternoon and then made public , reflects the growing importance of defense-related matters in Brussels. It also puts an end to weeks of speculation after predecessor Belén Martínez Carbonell was moved to lead the EU’s delegation in Mexico after two years in the post, as first