No sis, the UN Charter is US law... I know you feel it isn't, but the fact remains that you are wrong; but hey… deep down inside, you already knew that, dihndja?
Article 6 of the US Constitution says:
...all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land

The UN Charter was a Treaty signed by the US Government under its authority from Article 6, with other states.

It is the supreme Law of the Land

So it turns out you misjudged your situation on the board, which once again leaves you facing Check, Mate.

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Have you ever stood toe to toe with someone that was intent on kicking your arse? C-D-P