Stalin: pathologically paranoid and Machiavellian to the point where he and his minions invented conspiracies within the Communist Party of the Soviet Union which resulted in tons of people being executed, including most of his top military officers
Also Stalin: didn’t believe that Hitler would invade the Soviet Union right up until when it happened
God I hate to be the one to
technically defend Stalin on a topic but by all accounts the reason he was so blindsided by Barbarossa was he couldn’t believe Hitler would open a second front while Britain was still in the fight