Beat him up over Gaza all you want, but this is purely a GOP thing. Hinting at anything other than that is deliberately misleading. He has said he will sign a bill the second it hits his desk. The senate have passed a bipartisan bill. The house have numbers to pass it. However, the speaker of the house refuses to bring it to a vote. Because, erm, Jewish space lasers or something.
Biden has been unwavering in support of Ukraine, it's the weird Trump cult - which control the house - who are solely to blame for the Ukraine funding.