A report Saturday said that the United States was planning to intervene militarily in Syria, with or without United Nations authorization, if the killing in the country continued. A senior American official quoted in the London-based Al-Sharq al-Awsat newspaper said that the action would be based on the UN intervention in Kosovo several years ago: Establishment of a beachhead and carving out an area that was off-limits to forces controlled by Syrian President Bashar al-Assad, where refugees could come to flee Assad's troops, and which could be used as aforward base to reduce Assad's hold on the country, and eventually...