India, Jan. 16 -- US President Donald Trump on Friday warned that countries opposing his plans to acquire Greenland could face tariffs, escalating tensions over Washington's renewed push to take control of the semi-autonomous Danish territory.

Speaking at a health roundtable at the White House, Trump said Greenland was critical to US national security and suggested economic pressure could be used to secure international support.

Trump has revived his long-standing ambition to claim Greenland, arguing that the Arctic island is inadequately protected as Russia and China expand their presence and interest in the region's strategic shipping routes and mineral resources.

Russia, however, dismissed the claim on Thursday, calling the perceive...