> if there is any possible way to do that without "boots on the ground"

Of course there is but the Western allies are slow to arm Ukraine because they fear the Russian nuclear retaliation.

To recap, Ukraine received very few , around a hundred ATACMS missiles with severe restrictions on targets. They got less than two dozen F-16 jets. This is just nothing compared what the US might be able to send if they wanted to, they have over 300 Falcons at Davis-Monthan AFB (aka Boneyard) to begin with. There are near four thousand ATACMS missiles manufactured so far. And so on, with tanks etc.

If the "tap" were to open full stream instead of dripping, the war would be over very fast. The question is, which end would we get.