According to this:
http://www.wilsoncenter.org/publication/why-did-russia-give-away-crimea-sixty-years-ago Russia did not receive anything in return for Crimea. Apparently, it was Khrushchev's move in order to secure political support he needed within the Party.
And according to the BBC World Affairs Editor, there is no question about the will of Crimeans to go with Russia.
http://www.bbc.com/news/world-europe-26644082 Quote:
In modern times, Moscow has staged three major invasions: Hungary in November 1956 and Czechoslovakia in August 1968, when the Communist governments there began showing dangerously Western tendencies; and Afghanistan in December 1979, when the pro-Communist regime was on the point of collapse.
These were huge and brutal operations, involving large numbers of tanks, and sometimes great bloodshed.
The takeover of Crimea has been completely different. This was an infiltration, not an invasion. And unlike in Hungary, Czechoslovakia and Afghanistan it was welcomed by a large proportion of the local population.
According to a well-known opponent of Mr Putin's, the vote in Crimea to join the Russian Federation was "a referendum under the Kalashnikov". But it wasn't. The outcome was what the vast majority of Russian-speakers in Crimea really wanted, and there was little need for Kalashnikovs in the streets.
PS
Don't blame me, this is BBC.