As Ukrainian protesters prepare for what could be another deadly day of clashes, world leaders voice concern over the escalation of events.<br/> <br />At the European Union in Brussels, Commission President Jose Manuel Barroso condemns the violence.<br/> <br />(SOUNDBITE) (English) EUROPEAN COMMISSION PRESIDENT JOSE MANUEL BARROSO SAYING:<br/> <br />"We call on all sides to put an end to violence immediately and to engage into a serious dialogue. We believe that is the only way to respond to the democratic aspirations of the Ukrainian people."<br/> <br />After a night of petrol bombs and gunfire on Kiev's Independence Square, black smoke billowed from a burned out trade union building that protest organizers had used as headquarters.<br/> <br />So far, more than two dozen people have been killed in the country's worst violence since it gained independence from the former Soviet Union.<br/> <br />Amateur video taken from a social media website showed a protester being shot in the middle of the street.<br/> <br />In Russi
