Task: Analyze the tweet's sentiment and assign it to either 'neutral or no emotion' or one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
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