That's not even close to being true.
In 1994, through an accident of fate, the newly independent country of Ukraine found itself in possession of the world's third largest nuclear arsenal.
At first, Ukraine planned to keep its nuclear weapons. But, at the insistence of the two strongest powers in the world -- Russia and the United States -- Ukraine agreed to give up their nukes in exchange for perpetual guarantees of sovereignty and territorial integrity.
https://www.huffpost.com/entry/too-bad-ukraine-didnt-kee_b_5235374
How many Senators ratified the treaty you claim commits the US to ‘spilling blood’ in Ukraine?: