Greenland: How could Europe respond to Trump's tariffs threat?

Donald Trump's threat on Saturday to impose tariffs on eight European countries unless they support his plan to buy Greenland came as a shock.

The US president said he would introduce a 10% levy on imports into the US on 1 February, rising to 25% from the summer if no deal is done. It is unclear whether these tariffs would be added to existing levies.

France and Germany - part of the group of eight which includes the UK, Denmark, Norway, Sweden, the Netherlands and Finland - have said the European Union (EU) should be ready to act if Trump goes ahead with the taxes.

But what options does Europe have to response to the US?

Less than six months ago, the US and the EU agreed a deal that was supposed to stabilise transatlantic trade and provide certainty to businesses and consumers.