European Union foreign policy chief Catherine Ashton on Thursday responded to the arrest Bosnian Serb wartime general Ratko Mladic, saying, "It's of course a very important day for international justice and for the rule of law.""Mr Mladic will now face the charges against him in the International Tribunal; charges which are of course of a very serious nature," Ashton said. "I know that people will also be thinking about Serbia and its future in the European Union. What I know is that we will approach that with renewed energy because of today."