All that is needed is sanctions and enough resources for Ukraine to defend itself. And the military intelligence as a force multiplier.
Thats exactly what we have been providing. And it was working. Russian inflation is a 20%+. They are running out of soviet era equipment. They are running out of easily conscriptable men. All of this is documented using open sources.
All that was needed was time. Time for Russia to implode.
But democracy is a fickle thing, and Putin was counting on this. America will have to live with this period of infamy for a long time. And the world will suffer the consequences.