This week on Opinio Juris, we posted Harold Koh’s speech on international law in cyberspace, delivered earlier this week, as part of our efforts to make important international law speeches more readily available. The decision by the Obama administration to requalify the tragic events in Libya on September 11 as a terrorist attack rather than a spontaneous reaction provides a further basis, according to Julian Ku, for the legality of any US retaliation using armed force, including on the basis of the UAMF. Julian also followed up on...