Under President Donald Trump, the US has basically eliminated the only real international authority the UN used to have. Here is how this was done:
The equivalent, in international law, to a domestic-law crime involving murder, rape, and theft, is an international invasion that’s purely for aggressive purposes and not at all authentically a defensive act against an authentic foreign threat that was coming from the invaded foreign country. Consequently, for the US Government now to have removed the UN from any authority over international invasions, is, in domestic-law equivalency, like removing a national government from authority regarding murders, rapes, and thefts, which occur inside that nation. Such a ‘government’ is no government at all. But, tragically, this is what has happened; and, so, we are now careening into World War III, in this international “Wild West” world, which we live in (and may soon die in, as things thus head into WW III).
The US Government no longer even nominally cares whether or not the UN authorizes its invasions; but, as recently as 2003, it used to, even if only nominally, care. The US has thus effectively disgarded the UN altogether, whenever violating the UN is the only way to impose its will against a given target-country.
In late 2002 and early 2003, US President George W. Bush nominally expressed a desire for the UN to authorize an invasion of Iraq, but failed to receive that authorization and then did the invasion anyway, along with only UK, Australia, and Poland, joining the US-led gang, in this destruction of Iraq.
At a press conference on 6 March 2003, just 14 days before he ordered the UN weapons-inspectors to leave Iraq so that he could invade Iraq on March 20th (as he did), Bush said:
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