Does Mr. "I know words. I have the best words," even know what sarcastic means?

When questioned by a reporter about his promise to end the Ukraine-Russia war one day 1, his reply was, "I was being sarcastic." He very often says that when called out on some boast or claim that goes unfulfilled. I don't think he knows what the word really means.

The way he uses it, it pretty much means "I was lying."