The European Union and NATO Wednesday condemned the clashes between police and anti-government protestors in Ukraine's capital Kiev Tuesday night which led to the death of two people."I strongly condemn the violent escalation of events in Kyiv overnight leading to casualties. The reported deaths of several protesters is a source of extreme worry and my sympathy goes to all those affected," said EU High Representative for foreign affairs and security policy, Catherine Ashton, in a statement. She called on everyone to ensure restraint and noted that the use of force and resort to violence is not an answer to the political crisis. "All acts of violence must come to an immediate end and be swiftly investigated. Those responsible will have to be held to account. Ukrainian citizens' rights of assembly, freedom of expression and media must be fully respected and protected," said the EU foreign policy chief.On his part, NATO Secretary General Anders Fogh Rasmussen expressed his "extreme concern" about the dramatic developments in Ukraine and the reports of several deaths in Kyiv."I strongly condemn the use of violence. Violence can never be the answer to a political crisis. It is urgent that all parties engage in a real dialogue, show restraint and avoid any further escalation," said in a statement.