That could put its leaders in a difficult spot. While public support for Ukraine remains strong across Europe, committing troops to potentially dangerous duty on Ukrainian soil could quickly become a domestic political liability. Estimates on the size of a peacekeeping force vary widely, but under any scenario, it would be an extremely expensive undertaking at a time of straitened budgets.

President Emmanuel Macron of France, who first floated the idea of a peacekeeping force last year — to widespread skepticism in Europe — has been weakened since his decision to call parliamentary elections last summer backfired and left him with a fragile government.

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