European Commission President Jean-Claude Juncker arrives in the Grand Square in front of the Sibiu City Hall to attend the European Union (EU) informal summit in Sibiu, Romania, May 9, 2019. The leaders of the EU member states on Thursday agreed on defending "one Europe" and upholding the rules-based international order in their "10 commitments" declaration, made at an informal summit in Sibiu. (Xinhua/Chen Jin)