PARIS/WARSAW—France assured Poland on Wednesday of European Union support in its stand-off with Belarus, but reminded Warsaw it needed to resolve a row with the bloc over its values and the rule of law.
Polish Prime Minister Mateusz Morawiecki met French President Emmanuel Macron as part of a diplomatic effort to rally support for a tough response to what European Commission chief Ursula von der Leyen called an attempt by Belarus to use migrants to destabilize the EU.
