Vietnamese President Truong Tan Sang (left, shown here with Chinese Premier Li Keqiang in June) will meet with President Obama while suppressing dissidents, bloggers and religious leaders. (AP Photo/Mark Ralston, Pool)

Vietnamese President Truong Tan Sang (left, shown here with Chinese Premier Li Keqiang in June) will meet with President Obama while suppressing dissidents, bloggers and religious leaders. (AP Photo/Mark Ralston, Pool)