10th anniv. of entry into force of Lisbon Treaty marked in Brussels

European Parliament President David Sassoli, European Council President Charles Michel, European Commission President Ursula von der Leyen and European Central Bank President Christine Lagarde (R-L) attend a ceremony to mark the 10th anniversary of the entry into force of the Lisbon Treaty, at the House of European History in Brussels, Belgium, Dec. 1, 2019. (Xinhua/Zhang Cheng)