China has introduced sanctions against US pro-democracy NGOs and restrictions on US military presence in Hong Kong, after US President Donald Trump signed a bill supporting Hong Kong protesters last week.

On Monday, China’s Foreign Ministry said that US military vessels and aircraft would not be able to visit Hong Kong.

The move followed Beijing’s threat that it would take “firm counter measures” if Mr Trump signed the Hong Kong Human Rights and Democracy Act, which could lead to US sanctions on human rights violators in Hong Kong.

US military ships normally visit Hong Kong at least once a year, most recently last April, when the USS Blue Ridge command ship stopped off in the region. Two months later, in June, protests kicked off in the city over a proposed extradition bill between Hong Kong and China, before developing into a huge pro-democracy campaign.