How would we know if the United States is deliberately starving Ukraine of weapons in order to force it into a compromise peace settlement that leaves some Ukrainian territory -- maybe even a lot -- in Russian hands?
You can imagine the White House having such a strategy, though it would never admit it. After all, if Ukraine managed to drive the Russian army out of the whole country, Moscow might panic and escalate to nuclear weapons. President Biden's prime duty is to keep the United States safe, not to put the Ukrainian border back where it used to be.
For Ukraine, the war is literally existential. Russian leader Vladimir Putin wants not only to conquer Ukraine but to erase its very identity, so President Volodymyr Zelensky would risk anything, including nuclear war, to prevent it.