French President Emmanuel Macron speaks during a news conference after a Syria summit, in Istanbul, Turkey October 27, 2018. REUTERS/Murad Sezer

ISTANBUL (Reuters) - French President Emmanuel Macron said on Saturday that the international community would be watching to make sure that Russia and Turkey respect an agreement they have negotiated to create a demilitarized zone in Syria’s Idlib region.

“We will all be extremely vigilant to ensure that these commitments are met and that the ceasefire is stable and sustainable,” he told reporters after a four-way Syria summit with the leaders of Turkey, Russia and Germany.

Macron also said any military offensive by President Bashar al-Assad’s regime and its allies would have “unacceptable security and humanitarian consequences”.