Why did parliamentary systems fail in many Easter Europeans countries?

Parliamentary systems in many Eastern European countries failed primarily due to political instability, weak party structures, and a lack of democratic tradition. Post-communist transitions encountered challenges such as fragmented party systems and frequent changes in government, leading to ineffective governance. Additionally, the rise of populist movements and ethnic tensions further complicated the political landscape, undermining the legitimacy and functionality of parliamentary systems. As a result, many countries shifted towards more authoritarian or hybrid regimes to maintain stability.