BRUSSELS — The EU is gearing up for a monster week during which leaders will grapple with some of the toughest questions facing the continent. Their mission: Figure out how to make Europe a strong global player in an increasingly ruthless world. That means making the EU more economically competitive, reducing dependency on the U.S., and helping Ukraine resist Russia’s grinding, four-year invasion. The coming days will show whether “Europe can turn around and become truly united, fully mature