BUENOS AIRES (Reuters) - The trade relationship between the United States and Europe is improving, German Agriculture Minister Julia Kloeckner said on Saturday, but there is no guarantee the bloc will buy the quantity of soybeans that Washington expects. U.S. President Donald Trump and Jean-Claude Juncker, president of the European Commission, the EU’s executive body, struck a surprise deal on Wednesday that ended the risk of an immediate trade war between the two powers. After the talks, Trump highlighted benefits for U.S. farmers. “The European Union is going to start, almost immediately, to buy a lot of soybeans,” he told...