The world is witnessing a humanitarian catastrophe of historic proportions. It is happening in Syria. It is being perpetrated by the president of Russia, Vladimir Putin, in support of his protégé, Bashar al-Assad. Russian planes are bombing the civilian population of Aleppo, the country’s second-largest city, to assist Syrian government forces on the ground. The combined assault has, among other things, put the city’s remaining hospitals out of commission and deprived the population of drinking water.