European Union (EU): The EU is a political and economic union of 27 member states that are primarily located in Europe. EU member states cooperate in various areas, including trade, travel, agriculture, and foreign policy.
Eurozone: The Eurozone is a monetary union of 19 EU member states that have adopted the euro as their common currency.
Schengen Area: The Schengen Area is a zone of 26 European countries that have abolished border controls at their mutual borders. This allows for passport-free travel within the Schengen Area.
NATO (North Atlantic Treaty Organization): NATO is a military alliance of 30 countries, including most European countries as well as the United States and Canada. NATO members agree to come to the defense of any member state that is attacked by an external force.
Council of Europe: The Council of Europe is an international organization that promotes human rights, democracy, and the rule of law in Europe. It has 47 member states, including all European countries except for Belarus and the Vatican City.
Nordic Council: The Nordic Council is an inter-parliamentary organization that promotes cooperation among the Nordic countries: Denmark, Finland, Iceland, Norway, and Sweden.
Baltic Sea States: The Baltic Sea States are the countries that border the Baltic Sea: Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, and Sweden. They cooperate on issues related to the environment, shipping, and security.
Benelux: Benelux is a customs union and economic cooperation agreement between Belgium, the Netherlands, and Luxembourg.
These are just a few examples of alliances and partnerships among European countries. Many other regional and international organizations and agreements exist to promote cooperation and address common challenges in Europe.