The European Union is in talks to potentially impose tariffs on €93 billion ($108 billion) of US goods if President Donald Trump follows through on his threat to hit European countries with a 10% levy on February 1.

The EU is also weighing additional countermeasures beyond the tariffs but will first try to find a diplomatic solution, according to people familiar with the discussions. Representatives from the EU’s 27 countries met Sunday to begin preparing options.

EU leaders will hold an emergency meeting in Brussels later this week to explore possible retaliatory measures. European Council President Antonio Costa said in a social media post Sunday that the bloc’s nations were united in support of Denmark and Greenland and were ready “to defend ourselves against any form of coercion.”

Trump on Saturday announced a 10% tariff on goods from eight European countries starting February 1, rising to 25% in June, unless there’s a deal for the “purchase of Greenland.” Trump levied the threat after the countries said they would undertake token Nato military planning exercises in the semi-autonomous Danish territory.