WASHINGTON, 21 MAY - "China is once again ready to undertake a new Long March": it is the leader Xi Jinping to launch the challenge, addressed above all to the US after the escalation of tensions over duties and the Huawei case. Words that the experts interpret as a clear signal of Beijing's intention not to give up on the tug of war with Washington, still casting shadows on the possibility of an agreement. Speaking at an event in Jianxi province - reported the South China Morning Post - Xi had at his side the chief negotiator with the US, vice premier Liu He.