Russia and the United States at odds over Syria , which allegedly used chemical weapons . The United States is considering a possible military strike to overthrow Syria 's President al - Assad . Also invited to that meeting are groups representing human rights , the environment and LGBT rights . Russia is a major Syrian ally and doubts whether chemical weapons were used as alleged . Obama will also meet with Chinese and French presidents at G-20 .
Russia and the United States at odds over Syria , which allegedly used chemical weapons . The United States is considering a possible military strike to overthrow Syria 's President al - Assad . Russia is a major Syrian ally and doubts whether chemical weapons were used as alleged . Obama will also meet with Chinese and French presidents at G-20 .