Answer:
1) the issue of Taiwan (Both China and the United States believed Taiwan should be part of China.)
2) joining forces against the Soviet Union
Step-by-step explanation:
In February 1972 trip to China, Richard Nixon and Henry Kissinger discussed series of things with Mao Zedong. This include talks with Zhou Enlai on the Vietnam War, Taiwan, and the Shanghai Communique.
Kissinger's top secret intelligence briefing to the Chinese on Soviet military forces arrayed against China as well as his concerns about the possibility of Taiwanese independence and prospective Japanese influence over Taiwan were part of what was discuseed during the secret meeting.