U.S. forces this week wrapped up their participation in an annual Arctic training exercise that for the first time was held in both Alaska and Greenland. Arctic Edge, which began in 2018, includes training to respond to threats that Russia — and increasingly China — could pose to the U.S.  The portion in Greenland was coordinated with Denmark and involved both U.S. and Danish special forces. The long-planned exercise took place despite President Trump's repeated threats this year to take