China's foreign minister warned Tuesday against the "bullying" of any Chinese citizen, amid a diplomatic fracas over the arrest of a Huawei executive on a US warrant in Canada.

China voiced hope on Wednesday Donald Trump's sudden firing of Secretary of State Rex Tillerson will not impact bilateral relations or planned talks between the US president and North Korea's leader.

China warned Tuesday that any conflict on the Korean peninsula would have "no winners", after North Korea accused US President Donald Trump of declaring war on it.

China was muted Monday after Donald Trump's latest Twitter tirade, with analysts suggesting Beijing was scrambling to work out what the outburst could mean for relations with Washington.