AH Challenge: WP Invades Yugoslavia

How can we get the Warsaw Pact to invade Yugoslavia during the Cold War, with no ASB interventions? I know that Stalin and Tito did not get along (perhaps that's an understatement), but would the USSR and the Warsaw Pact ever take things to this level?

How would such a war be prosecuted? Who would win? Would NATO get involved, and/or would it be seen in the same light as the Soviet invasions of Hungary and Czechoslovakia?
 
Tito dies earlier (1960s), his successor tries to liberalise, democraticise and capitalise and align with West. SU declares it will not stand for that and invades.
 
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