Trade deals have diplomatic and economic influence. There's no such thing as 100% power - 0% power, even in imperialist relationships. It isn't simply "either/or" in those terms. Your definition is vague to the point of obfuscating how and why imperialism functions, and you're using it as evidence to say the soviets supporting a liberation movement was "imperialism," as though the goal was to plunder Afghanistan. This rejection of in-depth analysis is self-defeating, and gives us no understanding of how Tunisia can escape imperialism, while the definition I gave did.