By Sarah Marsh, Benoit Van Overstraeten and Andreas RinkeBERLIN/PARIS (Reuters) - New German Chancellor Friedrich Merz announced a reset in French-German relations to help Europe overcome the "enormous" security and economic challenges it faced during his first trip abroad since taking office to top ally France on Wednesday.

While already planned, the trip comes only a day after Merz was elected chancellor by parliament on the second round of voting. His unprecedented failure to succeed on the first round underscored disunity in the coalition of his conservatives and Social Democrats.

Merz and French President Emmanuel Macron — firm believers in the European Union and leaders of the continent's largest economies — used their first meeting since the German leader’s appointment Tuesday to show unity on Ukraine and other issues causing alarm in Europe.