Foreign relations of Belgium sanctioned the creation of Belgium in 1831 on the condition that the country remain strictly neutral. This policy of neutrality ended after the experience of German occupation during World War I. In the years preceding World War II, Belgium tried to return to a policy of neutrality, but once again, Germany invaded the country. In 1948, Belgium signed the Treaty of Brussels with the United Kingdom, France, the Netherlands, and Luxembourg, and one year later became one of the founding members of the Atlantic Alliance. The Belgians have been strong advocates of European integration, and most aspects of their foreign,
Locked Out of Heaven debuted at number 32 in Denmark, becoming Mars' fifth top-fifteen single in the country and peaked at number two, spending one week. "Locked Out of Heaven" peaked at number seven in Germany. "Locked Out of Heaven" peaked at number eight in Norway and Switzerland, six in Sweden, and 11 in Finland. "Locked Out of Heaven" entered the New Zealand Singles Chart at number 23 on October 15, 2012. After five weeks the song jumped in the top ten, to number eight, remaining for two weeks, before climbing to number six. Eventually, the song peaked at number four after four weeks.