The 49-year-old member of jailed ex-premier Yulia Tymoshenko's cabinet was transferred out of intensive care late yesterday after being attacked by truncheon-wielding police during a small protest the night before.
"He received about 10 blows to the head," the former interior minister's spokeswoman said.
Nearly 20 protesters were injured in all when they tried to prevent the police from moving to jail three activists who were sentenced to six years for allegedly plotting to blow up a statue of Soviet founder Lenin in 2011.
The ex-Soviet nation of 46 million that once served as the breadbasket of Europe has been rocked by ceaseless demonstrations ever since Yanukovych in November ditched an historic EU trade deal in favour of tighter ties with old master Russia.
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The heart of the city remains occupied by a tent city protected by makeshift barricades to this day.
The deal removed the immediate threat of a painful Ukrainian currency devaluation and debt default but also dimmed the prospects of a so-called Association Agreement being struck with the European Union in the coming months.
But top opposition leaders such as former boxing champ Vitali Klitschko - another strong Tymoshenko supporter - said the latest outburst of police violence showed the importance of a continued effort to topple Yanukovych's team.
"We will do everything to remove the authorities and change a system that allows the police to beat its people on crazy orders," the statement said.
The protest movement had lost much of its steam in the past two weeks because of a winter holiday season that stretches in post-Soviet countries from New Year's Eve to Orthodox Christmas - celebrated according to the Julian Calendar on January 7.