Well, it's done. American, British and French forces carried out punitive air strikes last night to degrade Syria's capacity to perpetrate chemical-weapon attacks. The President, apparently forgetting the irony of a recent predecessor's boast, has posted a "Mission accomplished" tweet. Whether that will come back to haunt him depends on what his real mission was. Cynics will note that Trump's earlier threatening tweets gave the Syrians and Russians time to move any really valuable assets out of harm's way, for use on another occasion -- presuming, as most do, that the Russians were full of it when they claimed that the British staged the Douma atrocity to justify the air strikes. If those strikes leave Bashar al-Assad undeterred, then Trump won't have accomplished much apart from reconfirming his own toughness to his domestic base. However, the damage done to Syria may count for less than the damage done to Russia. Trump has carried out his threat, but to our knowledge the Russians either failed or did not bother to carry out their threat to shoot down American missiles. There's still time for Russia to find some proportionate way to retaliate, but until they do the President can plausibly claim to have proven Vladimir Putin a paper tiger, and perhaps to have proven his own ability to intimidate the dreaded Putin into acquiescence. Of course, extreme cynics and conspiracy theorists can still argue that Trump and Putin have stage-managed everything to some mutual benefit, but such people would see even a shooting war as proof of some Orwellian collusion allowing each man to consolidate authoritarian power at home. In short, they see what they want to see. The rest of us should be slower to draw conclusions. If Trump's demonstration renders Putin less assertive in the long run, that might be to the world's benefit, but he would still need to prove the worth of the venture to his America-first constituents who'll want to know how it all benefits them materially. This Syrian intervention may work out better than many fear, but whether it was worth doing and whether it was really our business are still up for discussion.