【正文】 a part in formulating and executing the government’s decisions.The Ministry of Defence is responsible for ensuring Britain’s defence and managing Britain’s involvement in its military treaty mitments. And the Department of Trade and Industry is for the international trade policy and British mercial relations with other countries.（2）Britain and International Institutions:Nowadays its foreign policy is largely shaped by its participation in a number of important international institutions.Britain is one of the five permanent members of the United Nations Security Council, along with Russia, China, the Us and France. It is also the sixth largest contributor to the UN’s budget. As a Security Council member, Britain retains the ability to have a large influence on world affairs. And the more important to Britain today in running of its affairs is its membership in the EU. Britain is also a member of the Commonwealth. Even though Britain granted its colonial territories independence, it continued to feel close to these new countries and wanted to continue to work with them. （3）Security and Defence Policy:Britain depends more on defence than most other advanced industrial countries and maintains larger professional forces. The keystone of British defence policy is its participation in NATO, which is monly known as the North Atlantic Treaty Orgnasition. In addition to its NATO mitments, Britain retains an independent nuclear weapons capability but it is highly unlikely for it to use, or need to use the capability. 。A Brief Introduction of the United KingdomThe full name of the country is the United Kingdom of Great Britain and Northern Ireland. It is a plicated name for what is in many ways a plicated country. There’re four parts, England, Scotland, Wales and Northern Ireland, which plete to the set.Here, as follows, are a few aspects of the United Kingdom.1. PoliticsThe Government of the United Kingdom(1) The Monar