President Donald Trump is touting a historic new Greenland security agreement that he says gives the United States permanent control over security on the strategically vital Arctic island. What does the deal actually do — and what could it mean for Russia, China and the future of U.S. membership in NATO? Meanwhile, Canada is moving …President Donald Trump is touting a historic new Greenland security agreement that he says gives the United States permanent control over security on the strategically vital Arctic island. What does the deal actually do — and what could it mean for Russia, China and the future of U.S. membership in NATO? Meanwhile, Canada is moving …