GG, your analysis of US Senator Lindsey Graham’s death and possible causes is excellent. However, saying “….since Russia’s full-scale invasion in February 2022” is extremely inaccurate and misleading.
Of course, in games of wars, the country commissioned to start the game is called the invader or attacker and country, but it is not a ‘real’ invasion. Putin and Zelensky agreed to the game. Ukraine trained for months for the game, recruited thousands of their own people and hired foreign mercenaries, to be able to play “defense”.