Leaders are one thing, and sort of a product of the pressures of their position, but over longer time scales and evolutionary cycles, "isolate in fear" isn't really a dominant strategy. You're gonna get behind and get wiped out eventually, or be constrained to a hyper-specific niche.

Do China's or Russia's leaders not?

Yes they certainly do. Either leadership attracts people with these traits, or the position leads to cultivation of these traits, or both.