The EU urged Burundi's government to prosecute the killers of an opposition leader and prevent the violence in the central African country from worsening.
Behind the kitsch, glitz and smoke machines of the Eurovision Song Contest -- hosted by Vienna -- hide more serious international geopolitical tensions.
Georgian President Giorgi Margvelashvili has warned European Union leaders against letting Russian aggression in Ukraine undermine the bloc's project of building closer links with ex-Soviet nations.
Hungarian Prime Minister Viktor Orban angered EU lawmakers and officials by insisting that Budapest had the right to debate closing the door to migrants.
French President Francois Hollande said that quotas for migrants in Europe were "out of the question" but said he supported a better distribution of refugees between EU countries.
Italy renewed its appeal to the EU for help in managing a relentless wave of migrant arrivals, after around 40 migrants died when their inflatable boat sank off the coast.
German Chancellor Angela Merkel insisted her country needed to work with American intelligence agencies, in the wake of claims Berlin helped the US spy on EU leaders and companies.
Western powers are getting set to counter an expertly crafted Russian disinformation campaign over Ukraine which has left them wrong-footed too many times for comfort.
Iran can play a major role in persuading Syrian President Bashar al-Assad to cooperate in peace talks, EU foreign affairs chief Federica Mogherini said.
Ukraine will press European leaders for peacekeepers to patrol its war-torn east and will angle for more international financial support at two days of high-level talks starting.