In may 1999 , china postponed its high - level military exchange programs with the united states in response to the serious incident of bombing of the chinese embassy in the federal republic of yugoslavia by the us - led nato 1999年5月,针对以美国为首的北约轰炸中国驻南斯拉夫联盟大使馆的严重事件,中国推迟了中美两军高层交往项目。