Ely Ratner is the Maurice R. Greenberg senior fellow in China studies at the Council on Foreign Relations. He was deputy national security advisor to Vice President Joe Biden from 2015 to 2017 and previously served in the Office of Chinese and Mongolian Affairs at the State Department and as a professional staff member on the U.S. Senate Foreign Relations Committee. His current work focuses on U.S.-China relations, regional security in East Asia, and U.S. national security policy in Asia.
US President Donald Trump (R) and China's President Xi Jinping arrive for a working session on the first day of the G20 summit in Hamburg, northern Germany, on July 7, 2017.
Leaders of the world's top economies gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / Patrik STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)
WASHINGTON, DC - JUNE 01: U.S. President Donald Trump announces his decision to pull the United States out of the Paris climate agreement in the Rose Garden at the White House June 1, 2017 in Washington, DC. Trump pledged on the campaign trail to withdraw from the accord, which former President Barack Obama and the leaders of 194 other countries signed in 2015. The agreement is intended to encourage the reduction of greenhouse gas emissions in an effort to limit global warming to a manageable level. (Photo by Chip Somodevilla/Getty Images)
US President Donald Trump (R) welcomes Chinese President Xi Jinping (L) to the Mar-a-Lago estate in West Palm Beach, Florida, on April 6, 2017. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
