Headline: Red Lines MatterPublication Date: Monday, May 13, 2013Primary Source: Foreign AffairsNon-Cato Author: MÃ¥lfrid Braut-HegghammerType: op-edFormat: Newspaper (Online)Nature of Mention: featuredScholar: Mueller, JohnResearch Area: Foreign Policy and National SecuritySubjects: SyriaAttached Files: Foreign Affairs - Mueller_0_1.pdf