Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: @JohnKerry can be as indignant as he wants but the world knows Obama will do nothing and Putin will just do what he wants #Aleppo #Syria
This tweet contains emotions: 
anger, disgust, pessimism