(ANSA) - BELGRADE, MAY 18 - Former German Chancellor Angela Merkel has urged Europe to play an active role in resolving Russia's aggression against Ukraine. She "personally believes it is absolutely right" to militarily support Ukraine while also acting as a deterrent, the former CDU leader said today at the WDR-Europaforum in Berlin. "What I regret is that, in my opinion, Europe is not fully realising its diplomatic potential." "Diplomacy has always been the flip side of the coin, even during the Cold War," Merkel stated. "Military deterrence combined with diplomatic activity is important to me." (ANSA).