Having some of these countries turn into democracies is better than having none of these countries turn into democracies. Large countries like Russia cannot cohesively rule over its populace without establishing some sort of dictatorship. Democracy in Russia didn't last because there were too many rich oligarchs corrupting government power back to a form they could control. China is in the same category.
If they have any hope to establish and maintain a democracy, the country must be broken up.