Sometimes friends join together into groups to have fun, but also to defend themselves against members of other groups. How are such relationships similar to the alliances formed by the Great Powers of Europe ?

Millitary Alliance or Aid

Explanation: Millitary Alliance or Aid; this is an existing accord between two countries on national security, by which the countries involved in this accord or agreement. agree to a mutual protection and support of eachother in case of a crisis that has not been recognised early enough. Who are the great powers of Europe, they are

1. UK

2. RUSSIA

3. GERMANY

4. ITALY

Those are examples of European great power of Europe who assist one another or help manages eachother other crisis.

The alliance formed by the Great Powers of Europe is cordial, reliable and strong within Europe and beyond.

Explanation:

The Big Four, also known as G4 or EU4, refers to France, Germany, Italy and the United Kingdom.[1] These countries are considered major European powers[2] and they are the Western European countries individually represented as full members of the G7, the G8, the G10 and the G20. France, Germany, Italy and the United Kingdom have been referred to as the "Big Four of Europe" since the interwar period (1919–1939), when the four countries signed the Four-Power Pact and the Munich Agreement.The term G4 was used for the first time when French President Nicolas Sarkozy called for a meeting in Paris[4] with Italian Prime Minister Silvio Berlusconi, Prime Minister of the United Kingdom Gordon Brown and Chancellor of Germany Angela Merkel to consider the response to the financial crisis during the Great Recession. The Organisation for Economic Co-operation and Development describes them as the "Four Big European Countries."

Reasons for the Alliance of the Four Big European Countries

A great power is a nation/state or group of nations or states, through its/their great economic, political and military strengths, is/are able to exert powers and influences not only over it/theirs own regions of the world, but beyond. In a modern context, recognized great powers first arose in Europe during the post-Napoleonic era. The formalization of the division between small powers and great powers came about with the signing of the Treaty of Chaumont in 1814.

However, in modern context as experienced in the alliance of the G4, the leaders of the four countries usually have a series of joint video conference calls with the US president (see NATO Quint), or with other leaders, on international issues. With Barack Obama they discussed for example the TTIP, the Syrian civil War and the use of chemical weapons during the conflict, the Crimean Crisis and international sanctions against Russia, the post-civil war violence in Libya, the Israeli–Palestinian conflict, the 2014 American intervention in Iraq and the Ebola virus disease. With Russia's President Vladimir Putin, they discussed, for example, the Vienna peace talks for Syria.

i don't know why don't you google it?