Trump's aggressive stance on Greenland strains NATO, challenging European sovereignty and igniting unprecedented transatlantic tensions.

"On top of everything else, Denmark, Norway, Sweden, France, Germany, The United Kingdom, The Netherlands, and Finland have journeyed to Greenland, for purposes unknown."

Transatlantic relations aren't broken, though they are damaged. And if Europeans want to try to cut through with Trump, they'll have to stick together, writes Europe Editor Katya…