 At the time, these negotiations were considered so sensitive that they were concealed from the American public, the State Department, the American secretary of state, and all foreign governments.On the morning of 21 February 1972, Richard Nixon arrived in Beijing, where he was greeted by Zhou, and later met with Mao Zedong.The diplomatic substance of Nixon's visit was resolved on 28 February, in the Shanghai Communique, which summarized both sides' positions without attempting to resolve them.