(Reuters) -China's ambassador to the United States, Xie Feng, has urged Washington to seek common ground with Beijing and pursue peaceful coexistence while warning that China stood ready to retaliate in the escalating trade war. Speaking at a public event in Washington on Saturday, details of which were posted on the Chinese embassy's web site, Xie said tariffs would devastate the global economy and drew a parallel between the Great Depression and tariffs imposed by the U.S. in 1930.