The course of action you outline hurts only Ukraine, and helps only Russia. Putin knows this, which is why he has zero incentive to make any concessions of any kind. If the U.S. is unwilling to increase support for Ukrainian resistance - and Trump has made it clear that he isn't - then we have no leverage over Putin at all. So Putin simply holds out, knowing that all the pressure to make concessions is going to come down on Ukraine, not Russia.
Nevertheless, Cutting Zelenskyy off would be my choice. I am against any proxy war with Russia.
The Russians are smart enough to prosecute the war just slow enough to kill Ukraines, but preserve Russian lives because they know the West is headed into a RECESSION. The Russians have a 3-4% GDP. Even with a drop in oil prices which appeared temporary this week, 3% is way north of a Recession.
Russia rather than fighting a fast war with huge losses is playing their winning hand. The West is spent. The US under Trump is acknowledging the war is lost. Russia will simply finish off Ukraine as the EU is coming to realize in the past two weeks that they cannot replace the US intel or military contribution to keep Ukraine in the War.
Zelinski has ensured Kiev will be de-Nazified by his very essence.
I am sure many in Germany are saddened by the prospect of Ukraine losing their Nazis.
The US is reducing forces in Europe, and the US is going to end up sanctioning the EU.
The divorce with the the Socialists in Europe with the loss of the Obama/Biden coalation is the price of Screwing Trump since 2016.