Question

what has sometimes occurred as a result of disagreements between the united states and the united nations (un)

Answer 1

The United States has withheld funds from the UN.

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Answer 2

From time to time, as a result of disagreements between the United States of America and the United Nations, there were times when the U.S. withheld funds destined to the UN or one of its projects or deeds.

During Trump's administration alone, this sort of decision happened more than once.