H.R. McMaster — the three-star general who served as former President Donald Trump’s national security adviser for a little more than a year — is shedding new light on how the 45th president of the United States was viewed by the rest of the world. The New York Times is reporting that in his new book, At War With Ourselves, McMaster wrote that Trump was often outmaneuvered by world leaders who used flattery to take advantage of him. This was particularly true with Russian President Vladimir Putin. In 2018, McMaster described how he once saw Trump writing a complimentary letter to Putin to go w…