THERE are good reasons to cheer the missile attack ordered by Donald Trump on a Syrian air base on April 6th. It sent a message to Bashar al-As-sad, Syria's despot, that America would not tolerate his use of chemical weapons. It also showed that Mr Trump, despite many indications to the contrary, was prepared to act to uphold an international norm and to do so for humanitarian reasons: he was outraged by a nerve-gas attack that killed more than 80 people in the rebel enclave of Idlib. But one barrage doesn't make a strategy.
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