The US invokes--you guessed it--self-defense, yet again

"The United States said on Tuesday that the American-led airstrikes against the Islamic State — carried out in Syria without seeking the permission of the Syrian government or the United Nations Security Council — were legal because they were done in defense of Iraq." "International law generally prohibits using force on the sovereign territory of another country without its permission or authorization from the United Nations, except as a matter of self-defense." (thanks Amir)