Grandparent's claim was that other nations "can rely on the US's military to scare off attacks". Ukraine clearly can't rely on that, any more than Taiwan can. This quibbling over accounting is beside the point.
Philippines have already kicked USA military out of all the various bases they had built there. (No one who knows a bit of history was surprised by that.) RoK will eventually spend more resources supporting DPRK than menacing it, and they might very well kick USA out in the next decade. Korea fairly exemplifies the situation of nations who might consider USA military "assistance". Their current situation is far from what they would consider ideal, even if worse could be imagined. They could keep militarizing more and more, running to stand still, but that won't be tenable forever. We're told to fear change, but the change that the militarists really fear is more peace.
And the US did provide substantial aid to the Ukraine. The US has provided over $1.5 billion to Ukraine. How much did Germany provide?