Trump could easily end hostile feelings with Russia by allowing Russia mineral rights in Alaska. Then he would understand Zelensky's feelings.
Give Putin what he wants and he will want more.
Suppose he met the conditions of his release by lying through his teeth?
Is it more expensive to keep him in prison or spend a lot of money on surveillance tech 24 hours a day?
Bankrupting the country to build up its weapons stockpiles seems extreme. Help other European nations develop their technology for defensive capabilities perhaps?
Europe really does need less reliance on America and should be able to defend itself. Once it reaches that level of defense, then it can lower America's impact on European politics and not get involved in unnecessary conflicts in the Middle East.