How could Europe respond to Trump's Greenland threats? Will they work?

US President Trump imposed new tariffs on eight European countries, including the UK, in response to their support for Danish sovereignty over Greenland. The tariffs, starting at 10% and rising to 25%, are intended to pressure Europe amid US efforts to acquire Greenland and test NATO unity. The EU is considering retaliatory measures but faces challenges due to differing member state interests and security dependence on the US.