An unfortunate reality - one that I have to admit as a communist myself - is that imperialism doesn't have to come from capitalist powers, even though capitalism has a distinct way of causing it and pretty much constantly leads to imperialist outcomes.

Aside from dismantling capitalism, we have to dismantle authoritarianism and we have to distribute power as evenly as possible. One man's unhealthy ambitions or political games can cause a lot of harm if this man is given full power.