European policymakers are confronting a stark financial dilemma as President Trump’s rhetoric on Greenland intensifies. Some investors now openly discuss a radical countermeasure: weaponizing the roughly $10 trillion in European-held US assets. This includes vast holdings of Treasury bonds and corporate equities, a portfolio whose sheer scale could theoretically disrupt American markets if deployed.

The debate reflects Europe’s limited traditional leverage against US trade threats. While the EU could theoretically sell these assets en masse, doing so would trigger a fire sale, crashing bond prices and spiking US borrowing costs. Such a move would also crater the value of Europe’s own reserves, creating a powerful deterrent against any coordinated action.

For investors, the discussion signals a deepening geopolitical risk premium in transatlantic markets. The mere mention of this nuclear option highlights the fragility of current financial plumbing. What to watch: whether European finance ministers formally address this risk in upcoming talks, or if it remains a background fear shaping portfolio allocations.