Germany War II in Europe. In response to Hitler's actions, two days later, on 3 September, after a British ultimatum to Germany to cease military operations was ignored, Britain and France declared war on Germany. In the spring of 1940, Germany conquered Denmark and Norway, the Netherlands, Belgium, Luxembourg, and France forcing the French government to sign an armistice after German troops occupied most of the country. The British repelled German air attacks in the Battle of Britain in the same year. In 1941, German troops invaded Yugoslavia, Greece and the Soviet Union. By 1942, Germany and other Axis powers controlled
France–Germany relations super nation encompassing the whole of Europe. Other practical problems of a possible core Europe are that France and Germany find it hard to establish agreement within various policy areas. Both countries want to strengthen European defence forces, but Germany is cutting its defence spending. Both France and Germany would like to boost the EU's foreign policy, but France no longer supports Germany's call for majority voting in foreign policy. On asylum and migration policies, the two countries have quite different approaches, and progress in other areas of justice and home affairs has been slow. However the two countries manage