WASHINGTON—The U.K.’s decision to leave the European Union dramatically expands the portfolio of foreign-policy challenges the next U.S. president will inherit, complicating critical decisions to address instability across the globe. President Barack Obama is unexpectedly embarking on a high-stakes effort during his last months in office to work out what a senior administration official called “alternative pathways” for Europe, an...

Source: Wall Street Journal June 27, 2016 22:01 UTC