https://en.wikipedia.org/wiki/Boris_Yeltsin
The dissolution of the USSR was led by liberals gaining power.
He later stood as a political independent, during which time he was viewed as being ideologically aligned with liberalism.
The purported goal of perestroika was not to end the planned economy, but rather to make socialism work more efficiently to better meet the needs of Soviet citizens by adopting elements of liberal economics.
Literally liberals doing a transition to liberalism under the guidance of the Washington Consensus, and you think the terrible results are the fault of socialism? Read some history please.