China vowed to deal a “head-on blow” to the United States after it imposed more sanctions on mainland Chinese officials over Hong Kong and warned American companies of the hazards of doing business in the city.

Beijing’s liaison office in Hong Kong slammed Washington on Saturday for its “unprovoked smearing” after it issued an advisory that warned of “clear operational, financial, legal and reputational risks” in the city, including from the national security law and potential retaliation against companies for compliance with US sanctions. It also dismissed the sanctions on seven officials from the office as “blatant provocations”.

“The successive sanctions imposed on us by the US have no meaning, other than to fuel our contempt towards US politicians and to arouse our strong will to fight for our national interests,” it said.