Arriving for his 15th visit to Europe since taking office US President George Bush hoped to find common ground with European leaders on several issues. Iran, North Korea, Guantanamo Bay and trade are all high on the agenda of the summit in Vienna.Analysts expect the gathering to have mixed results for the two sides. As ever security is tight with stringent measures in place around the Austrian capital. A large demonstration against the president is planned today. Bush’s trip follows a series of positive developments for his administration that have boosted his low popularity over the past six weeks. Chief among these was the US military’s killing of al Qaeda’s leader in Iraq last week. After Vienna Bush travels to Hungary for a ceremony marking the 50th anniversary of the uprising against Soviet rule. He will be back in Washington late on Thursday.