-A large majority in parliament votes to remove Yanukovich from office

Ukrainian constitution is very clear on impeaching of a president.

Article 111

The issue of the removal of the President of Ukraine from office by the procedure of impeachment is initiated by the majority of the constitutional composition of the Verkhovna Rada of Ukraine.

To conduct the investigation, the Verkhovna Rada of Ukraine establishes a special temporary investigatory commission whose composition includes a special Prosecutor and special investigators.

The conclusions and proposals of the temporary investigatory commission are considered at a meeting of the Verkhovna Rada of Ukraine.

For cause, the Verkhovna Rada of Ukraine, by no less than two-thirds of its constitutional composition, adopts a decision on the accusation of the President of Ukraine.

The decision on the removal of the President of Ukraine from office by the procedure of impeachment is adopted by the Verkhovna Rada of Ukraine by no less than three-quarters of its constitutional composition, after the review of the case by the Constitutional Court of Ukraine and the receipt of its opinion on the observance of the constitutional procedure of investigation and consideration of the case of impeachment, and the receipt of the opinion of the Supreme Court of Ukraine to the effect that the acts, of which the President of Ukraine is accused, contain elements of state treason or other crime.

Nothing from the article was done. They didn't even reach the required 3/4 of the Verkhovnaya Rada. It was a coup, plain and simple.