International relations Luxembourg is a member of the QuattroPole union of cities, along with Trier, Saarbrücken, and Metz (neighbouring countries: Germany and France).
intErnatioNaL ReLatioNS luXEmBOurG is A meMBEr Of tHe quaTTropolE unIOn oF ciTies, along WItH tRier, SaarbrÜcKen, And metz (neIgHbouRINg CoUntrieS: GERMany and frANce).