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Treaties Formal agreements between nations
Agreements/treaties/contracts between the states.
Diplomacy.
There are hundreds, from minor insignificant agreements to major agreements that affect the whole nation, as an example, Australia has free trade agreements with the following countries on a bilateral basis. (there are a few more through regional bodies) New Zealand Singapore Thailand US Chile
Of a small country (or a few small countries) signing a free trade agreement with a agreements between countries with large size differences.
Executive Agreements are not as binding as treaties. Executive agreements are made between two individuals, the executives of two agencies or two countries, and are really binding only as long as the two executives want them to be. Treaties are ratified by Congress and are agreements between two national governments. for the US, they are second in force only to the constitution itself, and are binding until one side or the other follows procedures included in the treaty to discontinue the agreement.
Biliteral agreements are agreements between two states. The most obvious conflict-resolving agreements are cease-fires and peace-treaties but also economical treaties can help to prevent conflicts as (for example) opening the borders for citizens of another state will bring the peoples closer to each other. The only difference between biliteral and multiliteral agreements is that the term biliteral means "exactly two states" whereas the term multiliteral just means "two or more states".
Strategic Arms Reduction Treaties (SART)
Often times an agreement between two or more nations are called "Treaties". Major treaties that are negotiated by the US Dept. of State, must be ratified by the US Senate.Generally speaking, most nations negotiate treaties but they are not finalized until another part of their government approves the treaty.
ALL treaties are international because they are agreements between nations.The Antarctic Treaty was signed by nations representing about 80% of the earth's population.
The navajo treaty talks about all the agreements made between the indians and the government. There are a number of treaties the united states and the navajo nation but many so not know how important these treaties were and still are. The very existence of these treaties establishes that hte united states must treat the navajo nation as a sovereign nation.
I believe that you may be referring to International Maritime Law. Treaties and agreements between the maritime nations of the world to regulate the conduct of shipping and commerce in the international waters of the oceans.