AN EXTRAORDINARY new crisis is beginning to unfold in Syria, a country that already has suffered through some of the worst war crimes, humanitarian depredations and refugee flows in recent history. Russia, Iran and the Syrian government are conducting a major offensive aimed at recapturing the city of Aleppo and the rebel-held territory that connects it to the border with Turkey. They have cut one supply route to the city and are close to severing another, trapping rebel forces along with hundreds of thousands of civilians. Tens of thousands have fled to the border, where Turkey is denying them entry.
This campaign is being waged in open defiance of a U.N. Security Council resolution adopted in December, which required the Syrian government to provide humanitarian access to areas under siege and demanded an end to the shelling and bombing of civilian areas. Russia, which voted for the resolution,...
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