By the time of Russia's most recent invasion, NATO had been doing some minor training with Ukraine to "westernize" their military. It only took a little bit. They also provided bits and pieces of equipment, primarily anti-tank missiles. Donald Trump in his first term tried to coerce Zelensky into opening up an "investigation" into Hunter Biden by threatening to withhold those weapons. There were impeachment hearings.

Then leading up to the actual invasion (Which US intelligence called weeks in advance, don't know why everyone is insisting that it wasn't expected, maybe they should reconsider who they pay attention to) the US was convinced it would be a steamroll fight and then Ukraine would run an insurgency, so they provided thousands more anti-tank missile launchers.

It wasn't until Ukraine had mostly stopped the invasion convoy that the west took them seriously, and it took even longer for the west to start providing supplies.