BRUSSELS — Ukraine will need Western troops to enforce any ceasefire with Russia’s Vladimir Putin, but voters in Europe’s two most powerful economies are deeply reluctant to help. People in France and Germany would rather put a peace deal at risk than commit their military personnel to safeguarding a truce, according to new results from The POLITICO Poll. The findings, from independent pollster Public First’s survey of more than 10,000 people in the U.S., Canada, the U.K., France and Germany,