WASHINGTON—President-elect Donald Trump’s recent remarks about potentially using military or economic measures to control Greenland have sparked global concerns. While some view his comments as extreme, there is a longstanding consensus within the U.S. national security community that China’s and Russia’s growing influence in the Arctic is worrisome and demands immediate attention. Trump has made similar statements regarding the Panama Canal, expressing frustration over the growing influence of Chinese state-owned companies in its operations. “I’m not going to commit to that,” Trump said on Jan. 7 when asked if he would rule out using military or economic coercion to control both Greenland and the Panama Canal….