N'Djamena: French President Emmanuel Macron on Sunday criticised US President's Donald Trump's decision to withdraw American forces from Syria, saying "an ally must be reliable".

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Speaking in the Chad capital, N'Djamena, Macron said "I deeply regret the decision" by Trump to pullout US troops.

Macron also paid tribute to Defence Secretary James Mattis, who said he was resigning on Thursday after Trump's Syria announcement.