You're assuming the west (or the US specifically) is not actually helping Ukraine out in this way. They've been on this since weeks before the invasion even happened. By putting it all out there, they really messed with Putin's plans.

I've always assumed they've been helping Ukraine out with propaganda. This whole invasion is like a wonderful insight into the Russian military for the US which would be invaluable. Or maybe they already knew that anyways.

I've been very impressed with Ukraine, seriously. Even if others' are helping, so what - they're not the ones who invaded a neighbouring country.