Two days before his death, US Sen. Lindsey Graham was in Kyiv discussing Russian sanctions, Ukraine’s air-defense needs, and the future of American support. It was his 10th visit to Ukraine since Russia launched its full-scale invasion in 2022, and the South Carolina Republican appeared to be following the same routine that had defined much of his career: travel to an allied country, meet its leaders, return to Washington and push their case inside Congress and the White House.