You are assuming that stopping the aid will stop the war. It won't, not soon at least.
Unless one of the two party wins the war, the way a peace agreement is reached is for both parties to consider it a better outcome than continuing the war, which means that the quickest way to reach is to make it harder for both countries to continue the war, and more palatable the result of an agreement.
This is not what Trump is doing. He is not doing harder for Russia to continue the war, in fact it is going to make it easier. He is not going to make the peace agreement more palatable for Ukraine, in fact it made it even harsher.
In other words, Trump is not looking for a "deal" is looking for a capitulation of Ukraine, and to offer it to Putin, probably behind some agreement.
Ukrainian people are not going to like the idea, so they will not surrender soon. Putin will see this as a victory, so he will not stop there (he is trying to get US troops out of Eastern Europe, and I am sure Trump will obey), so any "peace" will be short-lasting. Eastern Europe countries already see this, so they will not stop helping Ukraine because the US did.
Unless one of the two party wins the war, the way a peace agreement is reached is for both parties to consider it a better outcome than continuing the war, which means that the quickest way to reach is to make it harder for both countries to continue the war, and more palatable the result of an agreement.
This is not what Trump is doing. He is not doing harder for Russia to continue the war, in fact it is going to make it easier. He is not going to make the peace agreement more palatable for Ukraine, in fact it made it even harsher.
In other words, Trump is not looking for a "deal" is looking for a capitulation of Ukraine, and to offer it to Putin, probably behind some agreement.
Ukrainian people are not going to like the idea, so they will not surrender soon. Putin will see this as a victory, so he will not stop there (he is trying to get US troops out of Eastern Europe, and I am sure Trump will obey), so any "peace" will be short-lasting. Eastern Europe countries already see this, so they will not stop helping Ukraine because the US did.