Law of treaties arising from the Government's guidelines on the preparation of an agreement. Agreement and to respect the agreement. This practice is used widely until it became customary international (customary international law) and it has a written law is the law of treaties relating to the Vienna Convention, 1969, which is an agreement between countries in translating written action by the State and are in the scope of international law, but at the same time, other customary laws have specified in this Convention, there are still considered valid.
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