Unfortunately for Ukraine, it's running out of ammo. And NATO cannot replenish them (especially the 155mm shells for your “small US weapon”).

Unfortunately for Ukraine, it's losing the war. Ukraine is Dead Man Walking.

NATO tanks won’t arrive in time, nor in sufficient quantities, to make any difference in the outcome of the war. Fighter aircraft are even further away.

Russia has overwhelming military force in Ukraine. It won’t lose nearly as much as Ukraine will.