Basic knowledge of international law
International law is a supranational legal system. It governs the dealings of UN member states with each other and is defined by the United Nations Charter.
One of the principles is the prohibition of interstate violence, which was influenced in particular by experiences of World War 2.
In addition, international law contains fundamental values for all member states. These include, for example, human rights and cooperation to solve cross-border problems.
Compliance is monitored by courts such as the International Court of Justice in The Hague. In response, states can impose sanctions on other states. If a decision of the International Court of Justice is not implemented, sanctions can also be ordered by the UN Security Council.