http://youtu.be/85WBb9xA9AI   Key PointsClashes continue overnight as police renew their assault on the main protest camp in the capital, Kiev At least 18 people have died, including seven police officers, and scores of people have been injured in a long day of violence Crisis talks between main opposition leaders and President Viktor Yanukovych have failed, reports say Foreign governments are urging the authorities in Ukraine to end the violence The unrest began in November, when Mr Yanukovyc