What a weird and unsupported accusation. Claims without evidence do not require evidence to rebut.

The US is threatening Ukrainian territory, claiming "it's already been lost." The US is not respecting the sovereignty of the borders of Ukraine.

And that's not even getting into the US breaking its promise to respond strongly to Russia should Russia ever violate the memorandum during the Obama administration.

I do not know what you consider the lie, but I do know that the US has completely tarnished its reputation over the course of many presidential administrations and has put its own interest in the world at risk due to its weakness.