The US is providing some help but less so than Europe and much less so than what Ukraine is contributing.
And by saying "to the last Ukrainian" you're spreading a Russian-propaganda narrative. This slogan has been repeatedly used by Russian officials (including Putin, Peskov, Zakharova, Matviyenko), it's a recurring theme in the Russian information space and it's used by Russian bots.
He's spreading overtly obvious Russian propaganda, he's clearly very aware of it and just prefers to take the side of evil.