I have declined, you? Don't have much time plus I see no point at discussing again Ukraine's borders including Crimea (got that for u http://www.kyivpost.com/content/politics/tymoshenko-says-ukraine-will-take-crimea-back-as-russian-invasion-speeds-putins-demise-340415.html)
To me, it won't be so much Crimean return within the Russian Federation that will make history and allow V Putin to leave a long lasting heritage but rather once the dust has settled down around Crimea how he will fix what the 1954 decision was aimed at doing and how he will present that to the Ukrainian nation while showing Russia can deal with Ukraine's choices. U may want to have a look at that http://edition.cnn.com/2014/03/21/opinion/putin-khrushchev/. Although It is a personal opinion, it is difficult to dissociate the 1954 Supreme Soviet Presidium from the secret speech that will follow and not see it as the first stone of a long list of actions later called de-stabilisation as well as a compensation for the very wrong done to the Ukrainian nation even if it wouldn't be acknowledged as such. Fixing the wrong by doing another wrong can't be the way forward but now that the wrong done to Crimea's people is reversed, it leaves the most difficult in the air, how will the Kremlin address that poisonous heritage of the Stalin years that have played such an important role ever since in the sometime difficult relations between the Russian and the Ukrainian nations.