Yes. The Head of State Doctrine outlines this provision.
China
The US Congress needs to approve treaties the US becomes parties or signatories of. I'm not sure what you mean by UN treaties, however.
Monroe Doctrine
The doctrine of Parliamentary Sovereignty is that a nation/state's legislative body is not subject to judicial review by a court. Nation/States that follow Parliamentary Sovereignty include New Zealand and the United Kingdom. Otherwise, acts and statutes passed by a nation's legislative body may be declared unconstitutional as in the United States and France.
Latin America
Someone will probably try to contiribute an answer to this question that attributes it to so-called "International Law."HOWEVER - the fact is, only each individual nation, in accordance with the laws of THAT nation, has the power to enact treaties between themselvews and another sovereign nation.
China
China
The answer varies from one nation to another. In order for the question to be answerable, you will need to be more specific.
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.
Parent of the nation
The US Congress needs to approve treaties the US becomes parties or signatories of. I'm not sure what you mean by UN treaties, however.
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.
Not To Go To War!!
China
Truman Doctrine
9