GrauGeist
Generalfeldmarschall zur Luftschiff Abteilung
The Germans also delayed several types from being provided early on.And to that I would add that many nations in and out of NATO were willing to provide the Ukrainians with US made weapons like the F-16 but that was blocked by the US.
Likewise the Swiss prevented Swiss weapons going to Ukraine so the US was not alone but the US is directly responsible for much, maybe even the most, of the delay in Ukraine getting the weapons it needed, when they needed them.