They want those weapons to be sent because they believe(d) it would enable Ukraine to do things like take back Crimea. Which it hasn’t been able to do.

Now we pivot to them needing more to do what? Slow their loss?

I don’t think Ukraine can prevent a Russian victory without foreign troops. Not just volunteers; coordinated, foreign, military aid.

Russia has too many men. Their propaganda machine is too strong. Even if Ukrainians can kill more Russians per Ukrainians lost, the numbers simply cannot be ignored unless you are succumbing to propaganda.