But if you can't stop Russia from getting some of Ukraine, how do you stop it from getting all of Ukraine? That to me is the key problem.

Russia knows that time is on its side. It can just pause enough to rearm and then attack again. What will we do differently then?

Let Ukraine attack Russia through European territory. Let them take Kaliningrad and St. Petersburg. Ukraine is boxed in right now but all those other places are lightly defended

Kaliningrad likely has some nukes and offer no benefit for Ukraine to hold or even damage. most of the valuable targets for Ukraine would be reachable by long range missiles. No one wants to supply. Sadly the play seems to be increase Ukrainian lethality and force Russia to conscript more Russians from bigger cities to erode support for the conflict.

What makes you think it will go any differently than the first time? A pause will allow Ukraine to either rearm again as well or recapture territory.

Because Ukrainian soldiers are not unlimited, and Russia's population is about 3 times larger.

Plus, at some point Russia will start using nukes and then we will be forced to back down. We are not going to blow up the world to save Ukraine.

Ukraine is fighting an existential war. It has far more to lose and therefore can and will commit far more of its population and resources to the fight.

Russia has a greater population, but has been relying largely on conscripts among the poor, the incarcerated, and third world nations likes North Korea. Thats a resource that is far smaller in number than their total population. As soon as it’s tapped out, they either have to give up are start conscripting people in the middle and upper classes, and that will turn the Russian population on the war and their leaders faster than anything.

Right because countries with smaller populations can't beat larger ones when defending their homeland. Oh wait that's exactly what happened in Afghanistan vs USSR and USA, Vietnam etc.

I think Russia would be much more weary to attack a re-armed, well supported and "rested" Ukraine that would be bolstered by defeating goliath, even if at great loss, remember that everyone thought they would capitulate within two weeks.

In this war the only winners are US/EU weapons manufacturers, there is no winning scenario. Something Trump cannot understand and Putin cannot accept.