MOSCOW, March 24 (Reuters) - Russia wants to create demilitarised buffer zones inside Ukraine around areas it has annexed, an ally of President Vladimir Putin said on Friday, saying it might be necessary to push deeper into Ukraine if such zones cannot be set up. "We need to achieve all the goals that have been set to protect our territories, that is the territories of the Russian Federation," Medvedev, who is deputy chairman of Russia's Security Council, said in an interview with Russian media posted on Telegram. See here for a complete list of exchanges and delays