England
Foreign Affairs
In both Scotland and Wales, Edward saw mainly a reservoir of men and money. The Scots were in open rebellion at the time Edward took power, and he spent the first few years of his reign battling them with general success. Once the war with France began, though, he neglected both. This allowed the Welsh and especially the Scots to wriggle free of at least some of direct English royal control.
Ireland was an echo of Wales, but more troubled. In both countries, the crown imposed a layer of English lords over the local nobility but never supported them sufficiently to let those lords rule effectively. The result was an endless series of rebellions, large and small, on the Irish side with an endless parade of English half-efforts, incompetence, corruption, broken by occasional fits of savage reprisals. When there were lords who were or wished to be effective, their successes were isolated and impermanent. The war with France meant that Edward could never deal with Ireland as he hoped to.
Much of Edward's relations with Germany were dictated by the war with France. He took great pains to arrange imperial support prior to 1337, but the emperor never came through for him. He was actually married to an imperial daughter, Philippa, but Emperor Lewis was more interested in English money than English policy, and when Edward failed to pay his subsidies, Lewis refused to help with the invasion of 1339.
As with Germany, Edward's relations with Flanders and Brabant were conditioned by the demands of the Hundred Years' War. Since Count Louis de Nevers of Flanders was solidly in the French camp, Edward imposed an embargo of English wool. When 
Jakob van Arteveldt led a rebellion in Flanders, the rebels naturally were supported by Edward, but nothing lasting came of it. In short, Edward used every opportunity to meddle in the Low Countries either to aid his own cause or at least to hinder the cause of the French.
The pattern should be obvious. In foreign affairs as at home, the French war consumed Edward's time and resources, absorbed his victories and exploited his weaknesses.