"The NYTimes classification of actions by the US military:
“The trouble began when an errant American airstrike killed some 60 Syrian government soldiers. Then, Russia resumed its disingenuous grandstanding and the Syrian government, with Russia’s support, went back to indiscriminately bombing rebel-held areas of Aleppo. On Monday, less than a month after the agreement went into effect, Secretary of State John Kerry announced that the United States would break off talks with Russia on trying to revive it.”" (thanks Peter)