That's not really what they mean by imperialism. When Marxists speak of "imperialism," we mean the existing system of international extraction helmed by the US and its vassal states. Imperialism in the Marxist sense is economically compelled by late-stage capitalism, and is its necessary evolution, into a highly financialized system of plunder from the global south.

Russia and Iran are both sovereign countries working against this system, because both stand to gain from a multi-polar world. Ukraine and Israel are so close together because they share a similar geopolitical position, as attack dogs for the US Empire against their adversaries.

Without an understanding of how capitalism turns to imperialism, under what conditions, and how this can itself be negated, then it's understandable that it would be difficult to understand the world. I really recommend reading Lenin's Imperialism, the Current Highest Stage of Capitalism. Imperialism has evolved since his time, namely from competing imperialist powers into a single imperial hegemon and vassalized imperialist powers, but the basis is still correct and necessary for understanding the modern era.