Merkel's two-day visit came four months after Greece emerged from its third and final bailout package.
The European Court of Auditors has published a report criticizing the European Commission for their handling of the fight against fraud in EU spending.
The British prime minister is expecting the European Union to give further clarification on the backstop arrangement to maintain an open Irish border after Brexit.
Which European cities have the worst air quality? This interactive graphic shows where the concentration of nitrogen dioxide is the highest.