Oil prices fell by about 1.5% early on Thursday as U.S. President Donald Trump walked back on his threat to slap tariffs on NATO allies for supporting Greenland’s sovereignty. As of 7:42 a.m. ET on Thursday, the U.S. benchmark WTI Crude had dropped below the $60 per barrel mark, which it hit early this week amid intensified rhetoric regarding the U.S. interest in taking control of Denmark’s autonomous territory. WTI Crude traded 1.58% lower at $59.66. The international benchmark, Brent Crude, slipped below the $65…