Answer: The term "restoration" is derived from Charles II's coronation, which marked the return of the old English monarchical system of government after a brief period of republican administration.
There is so many reasons but they are complicated to explain
A unified group of countries, the Communist bloc was located in central and Eastern Europe, East Asia and Southeast Asia under the hegemony of the URSS. This bloc was denominated as Eastern bloc. And encompassed countries such as Poland, Romania, Bulgaria, Hungary and several other European countries. This was a group that was led by the mighty Stalin of USSR.