Ones under duress fled the country, vast majority in parliament remained at work
Not true.
The purpose of the extraordinary parliamentary session that evening was to pass a resolution returning Ukraine to the 2004 version of the constitution and pledging to form a unity government, thereby weakening the power of the President.
This was the first step of the negotiated Feb 21 agreement with the opposition and witnessed by no less than three European Union countries.
The resolution to return to the 2004 constitution passed 386-0 including 140 votes from the Party of Regions. Then the armed radicals showed up and demanded a second vote to impeach Yanukovitch. That coerced vote failed to garner the number required by the constitution despite physical attacks on some parliamentary members.
Yanukovitch was already planning to travel to eastern Ukraine that evening for a gathering of his political party over the weekend. The radicals tried to kill him as he left Kiev, shooting at his vehicle and injuring one of his aides.
Now you come along and present these events as lawful.
This is why Ukraine is a failed state. You people simply cannot be honest with each other about anything...including the time of day.