How does intentional differ? Would you count those who have died due to the US involvement in WW2 as intentional? I'd say no. I'd say US victims from Iraq war #2 were intentional.
You want to look at intentional deaths by the Kremlin? These are in the 10's of millions, and some in the most sadistic and cruel ways imagineable.
Let's ignore "intentional" then, you want to look at total deaths by the US versus the Kremlin? The Kremlin still wins that body count, by a long shot.
