Europe is ready to get back to work with the U.S., wary, frustrated and knowing it can¡¯t trust an ally it¡¯s relied on for decades.

With U.S. President Donald Trump¡¯s threats to seize Greenland off for now, European Union leaders at an emergency summit in Brussels Thursday said the bloc should now return to a to-do list that was already long before the American leader nearly brought the transatlantic alliance to its knees.

His latest demands scarred the relationship, they said. But, practically speaking, Europe can¡¯t ditch the U.S. economically or otherwise. It still needs U.S. trade, financial flows, energy, protection and, most pressingly, American security guarantees for Ukraine.