WASHINGTON — The drama surrounding Pete Hegseth’s Pentagon has a new lead player: a top aide known to his detractors as “Rasputin Ricky.” Ricky Buria, the defense secretary’s de facto chief of staff, is a rare Biden administration holdover and an internal critic of Vice President JD Vance’s “wackamamie crazy” and “isolationist” views — who has also slammed President Trump’s use of the military for immigration enforcement as “dumb.” Buria, 43, is also considered “incredibly intelligent and hardworking,” has fashioned himself as a China hawk and is seen by Hegseth as an effective administrator who keeps the office running smoothly...