China should remain neutral if North Korea launches an attack that threatens the United States, a Chinese state-run newspaper said on Friday, sounding a warning for Pyongyang over its plans to fire missiles near the U.S. Pacific territory of Guam. The comments from the influential Global Times came after U.S. President Donald Trump stepped up his rhetoric against North Korea again on Thursday, saying his earlier threat to unleash “fire and fury” on Pyongyang if it launched an attack may not have been tough enough. China, North Korea’s most important ally and trading partner, has reiterated calls for calm during the current crisis.