Imperialism is the final stage of capitalism. Finance capitalism takes over from industrial capitalism and seeks out markets abroad, having exhausted the internal ones. It teams up with other finance capitalism to become a global force, the export of capital becomes the most prominent feature of the economy rather than the export of raw materials or finished goods. The states they come from tend to become fascist in nature, or as some people put it, “fascism is imperialism turned inward”.
Even if China was a capitalist country as some people claim, it still wouldn’t be at that stage yet. Russia might wish to one day be there, but it too has a long way to go.