Actually, Yugoslavia was not really in USSR's influence zone. If it was in any zone, it was inside the Western influence zone. Look here Economy of the Socialist Federal Republic of Yugoslavia - Wikipedia
Yugoslavia owed heaps of money to the West, not the USSR. The West propped up Yugoslavia almost since its inception and it would have fell apart much sooner without support from the West.
It depends. For some time the status quo was more or less just as Churchill had offered to Stalin in Yalta: we go fifty-fifty about Yugoslavia. She was part of the Eastern Bloc, otherwise the Czechs, Poles, Bulgarians etc. wouldn't be allowed to visit the country, and they could. Yugoslavia was a socialist country, even if in her own unique way. When CIA forced a ban on already promised spare fighter parts, Tito went to USSR for reconciliation and was greeted with honours. Yugoslavia broke relations with the West many times due to the US' foreign policy including in the Middle East that Tito strongly opposed. Anyway, my point was that Yugoslavia wasn't theirs, and the US/UK wanted her whole, and indivisibly.
Look up "Operation Valuable" and "Operation Bloodstone".Can you elaborate on this? I'm not sure what you're referring to.
In short, the first one was Greece with US' backing and heavily funding the Holy Bond of Greek Officers/ IDEA made up of Nazi collaborators (1947); right after came Italy; then Albania with Balli Kombetar; then ratlines with Intermarium organisation and Ustachi smuggling ex-Nazis and Nazi collaborators to the US or wherever there was a job for them. The same tactic was applied to about any other country of the Eastern Bloc.
A very good book: Blowback - Americas Recruitment of Nazis and Its Destructive Impact on Our Domestic and Foreign Policy (2014) by Simpson Christopher. Another one, by the same author is The Splendid Blond Beast - Money, Law, and Genocide in the Twentieth Century where you can also learn how Tito's government's repeated requests to the Western allies to extradite dozens of Yugoslav Nazis and collaborators, including top-level officials, who had landed in U.S. and British hands were repeatedly turned down. Hoxha tried too.