The whole Crimean crisis has its roots in the ouster of former Ukrainian President Yanukovych. The Ukrainian parliament, with the support of Yanukovych's old Party of Regions, voted to impeach Yanukovych. They had a majority, but not the strict percentage (75%) required by the Ukrainian constitution to impeach their president. Nevertheless, they made motions to replace Yanukovych, motions which were accelerated by his fleeing the country into Russia.
Was this removal of an elected official an illegitimate coup, or was it a revolution that was acceptable given the circumstances?