Should Trump make good on his promise of a Russia-Ukraine cease-fire, Ukraine will have to receive security guarantees that deter Russia from invading again. Under such a scenario, it's imperative that international troops be deployed to Ukraine as part of that effort.
The possibility of an international peace-keeping force in Ukraine is only being discussed because Western nations are understandably worried of the consequences of Ukraine joining NATO. Unable to offer Ukraine that unrealistic goal, Western countries are trying to come up with another plan that would keep them happy.
There's a 6% chance that there will be a direct conflict between Russia and any NATO member state before 2027, according to the Metaculus community prediction.