These four European defense companies are critical to the continent's security spend as Trump's Greenland push threatens NATO security.

These four European defense companies are critical to the continent's security spend as Trump's Greenland push threatens NATO security.

Sector has jumped nearly 15% this month as investors bet domestic military spending will have to keep rising

European investors are the U.S.' biggest lender, offering the continent major leverage in a possible Greenland trade war, Deutsche Bank analysts said.