Europe can wield this $8 trillion ‘sell America’ weapon as Trump reignites a trade war over his Greenland conquest ambitions

As the European Union weighs options to retaliate against President Donald Trump’s latest tariffs, its most potent weapon may be in financial markets.

France is already urging the EU to deploy its “anti-coercion instrument,” which can target foreign direct investment and finance as well as trade. That’s after Trump announced new U.S. tariffs on NATO countries that sent troops to Greenland amid his plans to take over the semi-autonomous Danish territory.

At face value, a 10%...